21425234065664 has 72 divisors (see below), whose sum is σ = 50243484954432. Its totient is φ = 8989608683520.

The previous prime is 21425234065643. The next prime is 21425234065681. The reversal of 21425234065664 is 46656043252412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292593884 + ... + 292667099.

Almost surely, 2^{21425234065664} is an apocalyptic number.

It is an amenable number.

21425234065664 is an abundant number, since it is smaller than the sum of its proper divisors (28818250888768).

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

21425234065664 is a wasteful number, since it uses less digits than its factorization.

21425234065664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585261023 (or 585261009 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 50.

The spelling of 21425234065664 in words is "twenty-one trillion, four hundred twenty-five billion, two hundred thirty-four million, sixty-five thousand, six hundred sixty-four".