21324022464 has 56 divisors (see below), whose sum is σ = 57261930688. Its totient is φ = 7001913600.

The previous prime is 21324022417. The next prime is 21324022477. The reversal of 21324022464 is 46422042312.

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, 815962 + ... + 841689.

Almost surely, 2^21324022464 is an apocalyptic number.

21324022464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21324022464 is an abundant number, since it is smaller than the sum of its proper divisors (35937908224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21324022464 is a wasteful number, since it uses less digits than its factorization.

21324022464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657733 (or 1657723 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

Adding to 21324022464 its reverse (46422042312), we get a palindrome (67746064776).

The spelling of 21324022464 in words is "twenty-one billion, three hundred twenty-four million, twenty-two thousand, four hundred sixty-four".