21231333124 has 24 divisors (see below), whose sum is σ = 38082441600. Its totient is φ = 10352267616.

The previous prime is 21231333121. The next prime is 21231333163. The reversal of 21231333124 is 42133313212.

It is not an unprimeable number, because it can be changed into a prime (21231333121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151774 + ... + 255925.

It is an arithmetic number, because the mean of its divisors is an integer number (1586768400).

Almost surely, 2^21231333124 is an apocalyptic number.

It is an amenable number.

21231333124 is a deficient number, since it is larger than the sum of its proper divisors (16851108476).

21231333124 is a wasteful number, since it uses less digits than its factorization.

21231333124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408027 (or 408025 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

Adding to 21231333124 its reverse (42133313212), we get a palindrome (63364646336).

The spelling of 21231333124 in words is "twenty-one billion, two hundred thirty-one million, three hundred thirty-three thousand, one hundred twenty-four".