21206057513472 has 160 divisors (see below), whose sum is σ = 67599972908160. Its totient is φ = 6524940718080.

The previous prime is 21206057513383. The next prime is 21206057513489. The reversal of 21206057513472 is 27431575060212.

21206057513472 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 6 + 0 + 575 + 1 + 3 + 4 + 72 = 666.

It is a super-2 number, since 2×21206057513472² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58820404 + ... + 59179827.

It is an arithmetic number, because the mean of its divisors is an integer number (422499830676).

Almost surely, 2^{21206057513472} is an apocalyptic number.

It is an amenable number.

21206057513472 is an abundant number, since it is smaller than the sum of its proper divisors (46393915394688).

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

21206057513472 is a wasteful number, since it uses less digits than its factorization.

21206057513472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118000271 (or 118000249 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The spelling of 21206057513472 in words is "twenty-one trillion, two hundred six billion, fifty-seven million, five hundred thirteen thousand, four hundred seventy-two".