21312033312120 has 64 divisors (see below), whose sum is σ = 67697046997920. Its totient is φ = 5348902477824.

The previous prime is 21312033312107. The next prime is 21312033312133. The reversal of 21312033312120 is 2121333021312.

It is an interprime number because it is at equal distance from previous prime (21312033312107) and next prime (21312033312133).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5223535537 + ... + 5223539616.

Almost surely, 2^{21312033312120} is an apocalyptic number.

21312033312120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312033312120 is an abundant number, since it is smaller than the sum of its proper divisors (46385013685800).

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

21312033312120 is a wasteful number, since it uses less digits than its factorization.

21312033312120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10447075184 (or 10447075180 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21312033312120 its reverse (2121333021312), we get a palindrome (23433366333432).

The spelling of 21312033312120 in words is "twenty-one trillion, three hundred twelve billion, thirty-three million, three hundred twelve thousand, one hundred twenty".