21202112232 has 120 divisors (see below), whose sum is σ = 69081248610. Its totient is φ = 6057737280.

The previous prime is 21202112221. The next prime is 21202112291. The reversal of 21202112232 is 23221120212.

It can be written as a sum of positive squares in only one way, i.e., 18142473636 + 3059638596 = 134694^2 + 55314^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 302119 + ... + 365622.

Almost surely, 2^21202112232 is an apocalyptic number.

It is an amenable number.

21202112232 is an abundant number, since it is smaller than the sum of its proper divisors (47879136378).

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

21202112232 is a wasteful number, since it uses less digits than its factorization.

21202112232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 667773 (or 667753 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21202112232 its reverse (23221120212), we get a palindrome (44423232444).

The spelling of 21202112232 in words is "twenty-one billion, two hundred two million, one hundred twelve thousand, two hundred thirty-two".