21255233255212 has 96 divisors (see below), whose sum is σ = 42308857479168. Its totient is φ = 9255708000000.

The previous prime is 21255233255143. The next prime is 21255233255279.

21255233255212 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21255233255212² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1363993573 + ... + 1364009155.

It is an arithmetic number, because the mean of its divisors is an integer number (440717265408).

Almost surely, 2^{21255233255212} is an apocalyptic number.

21255233255212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21255233255212 is a deficient number, since it is larger than the sum of its proper divisors (21053624223956).

21255233255212 is a wasteful number, since it uses less digits than its factorization.

21255233255212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25631 (or 25629 counting only the distinct ones).

The product of its digits is 360000, while the sum is 40.

The spelling of 21255233255212 in words is "twenty-one trillion, two hundred fifty-five billion, two hundred thirty-three million, two hundred fifty-five thousand, two hundred twelve".