21440264440436 has 24 divisors (see below), whose sum is σ = 39738864424896. Its totient is φ = 10086662401920.

The previous prime is 21440264440409. The next prime is 21440264440493. The reversal of 21440264440436 is 63404446204412.

21440264440436 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44662706 + ... + 45140201.

It is an arithmetic number, because the mean of its divisors is an integer number (1655786017704).

Almost surely, 2^{21440264440436} is an apocalyptic number.

It is an amenable number.

21440264440436 is a deficient number, since it is larger than the sum of its proper divisors (18298599984460).

21440264440436 is a wasteful number, since it uses less digits than its factorization.

21440264440436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89806439 (or 89806437 counting only the distinct ones).

The product of its (nonzero) digits is 1769472, while the sum is 44.

The spelling of 21440264440436 in words is "twenty-one trillion, four hundred forty billion, two hundred sixty-four million, four hundred forty thousand, four hundred thirty-six".