21332224400 has 60 divisors (see below), whose sum is σ = 52217714772. Its totient is φ = 8371883520.

The previous prime is 21332224387. The next prime is 21332224423. The reversal of 21332224400 is 442223312.

It can be written as a sum of positive squares in 6 ways, for example, as 859193344 + 20473031056 = 29312^2 + 143084^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 481919 + ... + 524318.

Almost surely, 2^21332224400 is an apocalyptic number.

21332224400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21332224400 is an abundant number, since it is smaller than the sum of its proper divisors (30885490372).

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

21332224400 is a wasteful number, since it uses less digits than its factorization.

21332224400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006308 (or 1006297 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21332224400 its reverse (442223312), we get a palindrome (21774447712).

The spelling of 21332224400 in words is "twenty-one billion, three hundred thirty-two million, two hundred twenty-four thousand, four hundred".