21223023232 has 32 divisors (see below), whose sum is σ = 42513880500. Its totient is φ = 10552872960.

The previous prime is 21223023229. The next prime is 21223023259. The reversal of 21223023232 is 23232032212.

It can be written as a sum of positive squares in 2 ways, for example, as 13767736896 + 7455286336 = 117336^2 + 86344^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 434857 + ... + 481192.

Almost surely, 2^21223023232 is an apocalyptic number.

It is an amenable number.

21223023232 is an abundant number, since it is smaller than the sum of its proper divisors (21290857268).

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

21223023232 is an equidigital number, since it uses as much as digits as its factorization.

21223023232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916244 (or 916232 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21223023232 its reverse (23232032212), we get a palindrome (44455055444).

The spelling of 21223023232 in words is "twenty-one billion, two hundred twenty-three million, twenty-three thousand, two hundred thirty-two".