21255433356156 has 24 divisors (see below), whose sum is σ = 50936443899600. Its totient is φ = 6893654061312.

The previous prime is 21255433356127. The next prime is 21255433356181. The reversal of 21255433356156 is 65165333455212.

It is a junction number, because it is equal to n+sod(n) for n = 21255433356099 and 21255433356108.

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, 23936298381 + ... + 23936299268.

It is an arithmetic number, because the mean of its divisors is an integer number (2122351829150).

Almost surely, 2^{21255433356156} is an apocalyptic number.

It is an amenable number.

21255433356156 is an abundant number, since it is smaller than the sum of its proper divisors (29681010543444).

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

21255433356156 is a wasteful number, since it uses less digits than its factorization.

21255433356156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47872597693 (or 47872597691 counting only the distinct ones).

The product of its digits is 9720000, while the sum is 51.

The spelling of 21255433356156 in words is "twenty-one trillion, two hundred fifty-five billion, four hundred thirty-three million, three hundred fifty-six thousand, one hundred fifty-six".