Base | Representation |
---|---|
bin | 10010101111010100… |
… | …010101010100101011 |
3 | 1220221021121111010121 |
4 | 102233110111110223 |
5 | 312202012242303 |
6 | 13124335224111 |
7 | 1311423324151 |
oct | 225724252453 |
9 | 56837544117 |
10 | 20121212203 |
11 | 85959995a4 |
12 | 3a96678037 |
13 | 1b88837531 |
14 | d8c4393d1 |
15 | 7cb7109bd |
hex | 4af51552b |
20121212203 has 4 divisors (see below), whose sum is σ = 20122625160. Its totient is φ = 20119799248.
The previous prime is 20121212183. The next prime is 20121212207. The reversal of 20121212203 is 30221212102.
It is a happy number.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 20121212203 - 25 = 20121212171 is a prime.
It is a super-2 number, since 2×201212122032 (a number of 21 digits) contains 22 as substring.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (20121212207) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684898 + ... + 713671.
It is an arithmetic number, because the mean of its divisors is an integer number (5030656290).
Almost surely, 220121212203 is an apocalyptic number.
20121212203 is a deficient number, since it is larger than the sum of its proper divisors (1412957).
20121212203 is a wasteful number, since it uses less digits than its factorization.
20121212203 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1412956.
The product of its (nonzero) digits is 96, while the sum is 16.
Adding to 20121212203 its reverse (30221212102), we get a palindrome (50342424305).
It can be divided in two parts, 20121 and 212203, that added together give a square (232324 = 4822).
The spelling of 20121212203 in words is "twenty billion, one hundred twenty-one million, two hundred twelve thousand, two hundred three".
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