21252615430264 has 32 divisors (see below), whose sum is σ = 41948662870800. Its totient is φ = 10066377634560.

The previous prime is 21252615430261. The next prime is 21252615430301. The reversal of 21252615430264 is 46203451625212.

It is a self number, because there is not a number n which added to its sum of digits gives 21252615430264.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21252615430261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2155647 + ... + 6866734.

Almost surely, 2^{21252615430264} is an apocalyptic number.

It is an amenable number.

21252615430264 is a deficient number, since it is larger than the sum of its proper divisors (20696047440536).

21252615430264 is a wasteful number, since it uses less digits than its factorization.

21252615430264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9037903 (or 9037899 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 21252615430264 in words is "twenty-one trillion, two hundred fifty-two billion, six hundred fifteen million, four hundred thirty thousand, two hundred sixty-four".