| Base | Representation |
|---|---|
| bin | 100100001101110… |
| … | …1100110101101100 |
| 3 | 10010200122121221220 |
| 4 | 1020123230311230 |
| 5 | 4442044033400 |
| 6 | 320330223340 |
| 7 | 42054131442 |
| oct | 11033546554 |
| 9 | 3120577856 |
| 10 | 1215221100 |
| 11 | 573a62665 |
| 12 | 29ab84b50 |
| 13 | 1649c3652 |
| 14 | b7572b92 |
| 15 | 71a457a0 |
| hex | 486ecd6c |
1215221100 has 144 divisors (see below), whose sum is σ = 3739260672. Its totient is φ = 304029440.
The previous prime is 1215221087. The next prime is 1215221101. The reversal of 1215221100 is 11225121.
1215221100 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.
It is a Harshad number since it is a multiple of its sum of digits (15).
It is a self number, because there is not a number n which added to its sum of digits gives 1215221100.
It is not an unprimeable number, because it can be changed into a prime (1215221101) by changing a digit.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 364039 + ... + 367361.
It is an arithmetic number, because the mean of its divisors is an integer number (25967088).
Almost surely, 21215221100 is an apocalyptic number.
1215221100 is a gapful number since it is divisible by the number (10) 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 1215221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1869630336).
1215221100 is an abundant number, since it is smaller than the sum of its proper divisors (2524039572).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1215221100 is a wasteful number, since it uses less digits than its factorization.
1215221100 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 3416 (or 3409 counting only the distinct ones).
The product of its (nonzero) digits is 40, while the sum is 15.
The square root of 1215221100 is about 34860.0215146233. The cubic root of 1215221100 is about 1067.1327140969.
Adding to 1215221100 its reverse (11225121), we get a palindrome (1226446221).
The spelling of 1215221100 in words is "one billion, two hundred fifteen million, two hundred twenty-one thousand, one hundred".
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