21250236515636 has 12 divisors (see below), whose sum is σ = 37187957966628. Its totient is φ = 10625105668032.

The previous prime is 21250236515603. The next prime is 21250236515701. The reversal of 21250236515636 is 63651563205212.

It can be written as a sum of positive squares in 2 ways, for example, as 11133193182736 + 10117043332900 = 3336644^2 + 3180730^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1371080 + ... + 6661856.

It is an arithmetic number, because the mean of its divisors is an integer number (3098996497219).

Almost surely, 2^{21250236515636} is an apocalyptic number.

It is an amenable number.

21250236515636 is a deficient number, since it is larger than the sum of its proper divisors (15937721450992).

21250236515636 is a wasteful number, since it uses less digits than its factorization.

21250236515636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6294898 (or 6294896 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 47.

The spelling of 21250236515636 in words is "twenty-one trillion, two hundred fifty billion, two hundred thirty-six million, five hundred fifteen thousand, six hundred thirty-six".