21515522065272 has 96 divisors (see below), whose sum is σ = 61748805783600. Its totient is φ = 6744510508032.

The previous prime is 21515522065151. The next prime is 21515522065313. The reversal of 21515522065272 is 27256022551512.

21515522065272 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 5 + 522 + 0 + 6 + 52 + 72 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5591022 + ... + 8619197.

Almost surely, 2^{21515522065272} is an apocalyptic number.

It is an amenable number.

21515522065272 is an abundant number, since it is smaller than the sum of its proper divisors (40233283718328).

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

21515522065272 is a wasteful number, since it uses less digits than its factorization.

21515522065272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14211485 (or 14211478 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 45.

The spelling of 21515522065272 in words is "twenty-one trillion, five hundred fifteen billion, five hundred twenty-two million, sixty-five thousand, two hundred seventy-two".