21353231372 has 96 divisors (see below), whose sum is σ = 43574630400. Its totient is φ = 9060480000.

The previous prime is 21353231329. The next prime is 21353231447. The reversal of 21353231372 is 27313235312.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7113872 + ... + 7116872.

It is an arithmetic number, because the mean of its divisors is an integer number (453902400).

Almost surely, 2^21353231372 is an apocalyptic number.

21353231372 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21353231372 is an abundant number, since it is smaller than the sum of its proper divisors (22221399028).

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

21353231372 is a wasteful number, since it uses less digits than its factorization.

21353231372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3207 (or 3205 counting only the distinct ones).

The product of its digits is 22680, while the sum is 32.

Adding to 21353231372 its reverse (27313235312), we get a palindrome (48666466684).

The spelling of 21353231372 in words is "twenty-one billion, three hundred fifty-three million, two hundred thirty-one thousand, three hundred seventy-two".