21220232130 has 24 divisors (see below), whose sum is σ = 55172603772. Its totient is φ = 5658728544.

The previous prime is 21220232123. The next prime is 21220232177. The reversal of 21220232130 is 3123202212.

It can be written as a sum of positive squares in 2 ways, for example, as 21047335929 + 172896201 = 145077^2 + 13149^2 .

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 11 ways as a sum of consecutive naturals, for example, 117890089 + ... + 117890268.

Almost surely, 2^21220232130 is an apocalyptic number.

21220232130 is an abundant number, since it is smaller than the sum of its proper divisors (33952371642).

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

21220232130 is a wasteful number, since it uses less digits than its factorization.

21220232130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235780370 (or 235780367 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 21220232130 its reverse (3123202212), we get a palindrome (24343434342).

The spelling of 21220232130 in words is "twenty-one billion, two hundred twenty million, two hundred thirty-two thousand, one hundred thirty".