21255205025516 has 96 divisors (see below), whose sum is σ = 46450185868800. Its totient is φ = 8267829857280.

The previous prime is 21255205025501. The next prime is 21255205025533. The reversal of 21255205025516 is 61552050255212.

It is a super-2 number, since 2×21255205025516² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 666145235 + ... + 666177141.

It is an arithmetic number, because the mean of its divisors is an integer number (483856102800).

Almost surely, 2^{21255205025516} is an apocalyptic number.

It is an amenable number.

21255205025516 is an abundant number, since it is smaller than the sum of its proper divisors (25194980843284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21255205025516 is a wasteful number, since it uses less digits than its factorization.

21255205025516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35367 (or 35365 counting only the distinct ones).

The product of its (nonzero) digits is 300000, while the sum is 41.

The spelling of 21255205025516 in words is "twenty-one trillion, two hundred fifty-five billion, two hundred five million, twenty-five thousand, five hundred sixteen".