21058861139502 has 16 divisors (see below), whose sum is σ = 42123388683600. Its totient is φ = 7018675979072.

The previous prime is 21058861139479. The next prime is 21058861139551. The reversal of 21058861139502 is 20593116885012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 236051877 + ... + 236141072.

It is an arithmetic number, because the mean of its divisors is an integer number (2632711792725).

Almost surely, 2^{21058861139502} is an apocalyptic number.

21058861139502 is an abundant number, since it is smaller than the sum of its proper divisors (21064527544098).

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

21058861139502 is a wasteful number, since it uses less digits than its factorization.

21058861139502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472200387.

The product of its (nonzero) digits is 1036800, while the sum is 51.

The spelling of 21058861139502 in words is "twenty-one trillion, fifty-eight billion, eight hundred sixty-one million, one hundred thirty-nine thousand, five hundred two".