21526402790 has 128 divisors (see below), whose sum is σ = 42604904448. Its totient is φ = 7812080640.

The previous prime is 21526402787. The next prime is 21526402819. The reversal of 21526402790 is 9720462512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39353297 + ... + 39353843.

It is an arithmetic number, because the mean of its divisors is an integer number (332850816).

Almost surely, 2^21526402790 is an apocalyptic number.

21526402790 is a deficient number, since it is larger than the sum of its proper divisors (21078501658).

21526402790 is a wasteful number, since it uses less digits than its factorization.

21526402790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 21526402790 in words is "twenty-one billion, five hundred twenty-six million, four hundred two thousand, seven hundred ninety".