21332224520 has 32 divisors (see below), whose sum is σ = 48001668120. Its totient is φ = 8532149760.

The previous prime is 21332224513. The next prime is 21332224567. The reversal of 21332224520 is 2542223312.

It can be written as a sum of positive squares in 4 ways, for example, as 8093881156 + 13238343364 = 89966^2 + 115058^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21332224520.

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, 863054 + ... + 887426.

Almost surely, 2^21332224520 is an apocalyptic number.

21332224520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21332224520 is an abundant number, since it is smaller than the sum of its proper divisors (26669443600).

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

21332224520 is a wasteful number, since it uses less digits than its factorization.

21332224520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46265 (or 46261 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 21332224520 its reverse (2542223312), we get a palindrome (23874447832).

The spelling of 21332224520 in words is "twenty-one billion, three hundred thirty-two million, two hundred twenty-four thousand, five hundred twenty".