21079976856928 has 72 divisors (see below), whose sum is σ = 46043354618856. Its totient is φ = 9492257871360.

The previous prime is 21079976856899. The next prime is 21079976856937. The reversal of 21079976856928 is 82965867997012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25025925 + ... + 25854532.

It is an arithmetic number, because the mean of its divisors is an integer number (639491036373).

Almost surely, 2^{21079976856928} is an apocalyptic number.

It is an amenable number.

21079976856928 is an abundant number, since it is smaller than the sum of its proper divisors (24963377761928).

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

21079976856928 is a wasteful number, since it uses less digits than its factorization.

21079976856928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50880596 (or 50880577 counting only the distinct ones).

The product of its (nonzero) digits is 1646023680, while the sum is 79.

The spelling of 21079976856928 in words is "twenty-one trillion, seventy-nine billion, nine hundred seventy-six million, eight hundred fifty-six thousand, nine hundred twenty-eight".