21231300120 has 32 divisors (see below), whose sum is σ = 63693900720. Its totient is φ = 5661680000.

The previous prime is 21231300091. The next prime is 21231300137. The reversal of 21231300120 is 2100313212.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21231300120.

It is a congruent number.

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, 88463631 + ... + 88463870.

Almost surely, 2^21231300120 is an apocalyptic number.

21231300120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21231300120 is an abundant number, since it is smaller than the sum of its proper divisors (42462600600).

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

21231300120 is a wasteful number, since it uses less digits than its factorization.

21231300120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176927515 (or 176927511 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21231300120 its reverse (2100313212), we get a palindrome (23331613332).

The spelling of 21231300120 in words is "twenty-one billion, two hundred thirty-one million, three hundred thousand, one hundred twenty".