21311011312 has 40 divisors (see below), whose sum is σ = 41757372000. Its totient is φ = 10535212800.

The previous prime is 21311011303. The next prime is 21311011313.

It is a happy number.

21311011312 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21311011312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311011313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1191814 + ... + 1209562.

It is an arithmetic number, because the mean of its divisors is an integer number (1043934300).

Almost surely, 2^21311011312 is an apocalyptic number.

It is an amenable number.

21311011312 is a deficient number, since it is larger than the sum of its proper divisors (20446360688).

21311011312 is a wasteful number, since it uses less digits than its factorization.

21311011312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18601 (or 18595 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

It can be divided in two parts, 213110 and 11312, that added together give a palindrome (224422).

The spelling of 21311011312 in words is "twenty-one billion, three hundred eleven million, eleven thousand, three hundred twelve".