21207892866265 has 64 divisors (see below), whose sum is σ = 30363767723520. Its totient is φ = 13916905666560.

The previous prime is 21207892866263. The next prime is 21207892866283. The reversal of 21207892866265 is 56266829870212.

It is not a de Polignac number, because 21207892866265 - 2¹ = 21207892866263 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21207892866197 and 21207892866206.

It is not an unprimeable number, because it can be changed into a prime (21207892866263) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 349594506 + ... + 349655164.

It is an arithmetic number, because the mean of its divisors is an integer number (474433870680).

Almost surely, 2^{21207892866265} is an apocalyptic number.

It is an amenable number.

21207892866265 is a deficient number, since it is larger than the sum of its proper divisors (9155874857255).

21207892866265 is a wasteful number, since it uses less digits than its factorization.

21207892866265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65362.

The product of its (nonzero) digits is 69672960, while the sum is 64.

The spelling of 21207892866265 in words is "twenty-one trillion, two hundred seven billion, eight hundred ninety-two million, eight hundred sixty-six thousand, two hundred sixty-five".