21657150319672 has 16 divisors (see below), whose sum is σ = 46408179256560. Its totient is φ = 9281635851264.

The previous prime is 21657150319669. The next prime is 21657150319697. The reversal of 21657150319672 is 27691305175612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193367413513 + ... + 193367413624.

It is an arithmetic number, because the mean of its divisors is an integer number (2900511203535).

Almost surely, 2^{21657150319672} is an apocalyptic number.

It is an amenable number.

21657150319672 is an abundant number, since it is smaller than the sum of its proper divisors (24751028936888).

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

21657150319672 is a wasteful number, since it uses less digits than its factorization.

21657150319672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386734827150 (or 386734827146 counting only the distinct ones).

The product of its (nonzero) digits is 4762800, while the sum is 55.

The spelling of 21657150319672 in words is "twenty-one trillion, six hundred fifty-seven billion, one hundred fifty million, three hundred nineteen thousand, six hundred seventy-two".