21364767426465 has 48 divisors (see below), whose sum is σ = 38242833108480. Its totient is φ = 11022367000320.

The previous prime is 21364767426449. The next prime is 21364767426469. The reversal of 21364767426465 is 56462476746312.

21364767426465 is a `hidden beast` number, since 2 + 1 + 3 + 6 + 476 + 7 + 42 + 64 + 65 = 666.

It is not a de Polignac number, because 21364767426465 - 2⁴ = 21364767426449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21364767426469) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 138226 + ... + 6538244.

It is an arithmetic number, because the mean of its divisors is an integer number (796725689760).

Almost surely, 2^{21364767426465} is an apocalyptic number.

It is an amenable number.

21364767426465 is a deficient number, since it is larger than the sum of its proper divisors (16878065682015).

21364767426465 is a wasteful number, since it uses less digits than its factorization.

21364767426465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6402454 (or 6402451 counting only the distinct ones).

The product of its digits is 243855360, while the sum is 63.

The spelling of 21364767426465 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred sixty-seven million, four hundred twenty-six thousand, four hundred sixty-five".