| Base | Representation |
|---|---|
| bin | 111000011001011011… |
| … | …0011101011000011100 |
| 3 | 102120121112000022011200 |
| 4 | 1300302312131120130 |
| 5 | 3441014212034322 |
| 6 | 131345503115500 |
| 7 | 11515162615563 |
| oct | 1606266353034 |
| 9 | 376545008150 |
| 10 | 121112221212 |
| 11 | 473aa767404 |
| 12 | 1b5802a2b90 |
| 13 | b561756928 |
| 14 | 5c0cd46bda |
| 15 | 323c9528ac |
| hex | 1c32d9d61c |
121112221212 has 144 divisors (see below), whose sum is σ = 322650488160. Its totient is φ = 38256551424.
The previous prime is 121112221211. The next prime is 121112221259. The reversal of 121112221212 is 212122211121.
121112221212 is a `hidden beast` number, since 121 + 112 + 221 + 212 = 666.
It is a Harshad number since it is a multiple of its sum of digits (18).
It is a nude number because it is divisible by every one of its digits.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (121112221211) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 21361114 + ... + 21366782.
It is an arithmetic number, because the mean of its divisors is an integer number (2240628390).
Almost surely, 2121112221212 is an apocalyptic number.
121112221212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 121112221212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161325244080).
121112221212 is an abundant number, since it is smaller than the sum of its proper divisors (201538266948).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
121112221212 is a wasteful number, since it uses less digits than its factorization.
121112221212 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 6132 (or 6127 counting only the distinct ones).
The product of its digits is 64, while the sum is 18.
Adding to 121112221212 its reverse (212122211121), we get a palindrome (333234432333).
The spelling of 121112221212 in words is "one hundred twenty-one billion, one hundred twelve million, two hundred twenty-one thousand, two hundred twelve".
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