21357136312 has 32 divisors (see below), whose sum is σ = 44243690400. Its totient is φ = 9613441024.

The previous prime is 21357136309. The next prime is 21357136319. The reversal of 21357136312 is 21363175312.

It is a super-2 number, since 2×21357136312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21357136319) 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, 3410737 + ... + 3416992.

It is an arithmetic number, because the mean of its divisors is an integer number (1382615325).

Almost surely, 2^21357136312 is an apocalyptic number.

It is an amenable number.

21357136312 is an abundant number, since it is smaller than the sum of its proper divisors (22886554088).

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

21357136312 is a wasteful number, since it uses less digits than its factorization.

21357136312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6827775 (or 6827771 counting only the distinct ones).

The product of its digits is 22680, while the sum is 34.

The spelling of 21357136312 in words is "twenty-one billion, three hundred fifty-seven million, one hundred thirty-six thousand, three hundred twelve".