21264436324 has 24 divisors (see below), whose sum is σ = 37789819200. Its totient is φ = 10468221024.

The previous prime is 21264436301. The next prime is 21264436327. The reversal of 21264436324 is 42363446212.

It is not an unprimeable number, because it can be changed into a prime (21264436327) 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, 12024 + ... + 206575.

It is an arithmetic number, because the mean of its divisors is an integer number (1574575800).

Almost surely, 2^21264436324 is an apocalyptic number.

It is an amenable number.

21264436324 is a deficient number, since it is larger than the sum of its proper divisors (16525382876).

21264436324 is a wasteful number, since it uses less digits than its factorization.

21264436324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218979 (or 218977 counting only the distinct ones).

The product of its digits is 165888, while the sum is 37.

The spelling of 21264436324 in words is "twenty-one billion, two hundred sixty-four million, four hundred thirty-six thousand, three hundred twenty-four".