21311711312 has 40 divisors (see below), whose sum is σ = 43123144704. Its totient is φ = 10183941504.

The previous prime is 21311711293. The next prime is 21311711353.

21311711312 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21311711312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 422513 + ... + 470255.

Almost surely, 2^21311711312 is an apocalyptic number.

It is an amenable number.

21311711312 is an abundant number, since it is smaller than the sum of its proper divisors (21811433392).

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

21311711312 is a wasteful number, since it uses less digits than its factorization.

21311711312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48987 (or 48981 counting only the distinct ones).

The product of its digits is 252, while the sum is 23.

The spelling of 21311711312 in words is "twenty-one billion, three hundred eleven million, seven hundred eleven thousand, three hundred twelve".