21331013312 has 56 divisors (see below), whose sum is σ = 48391669536. Its totient is φ = 9138843648.

The previous prime is 21331013273. The next prime is 21331013321.

21331013312 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (56).

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, 1827848 + ... + 1839480.

It is an arithmetic number, because the mean of its divisors is an integer number (864136956).

Almost surely, 2^21331013312 is an apocalyptic number.

It is an amenable number.

21331013312 is an abundant number, since it is smaller than the sum of its proper divisors (27060656224).

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

21331013312 is a wasteful number, since it uses less digits than its factorization.

21331013312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15745 (or 15735 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

It can be divided in two parts, 213310 and 13312, that added together give a palindrome (226622).

The spelling of 21331013312 in words is "twenty-one billion, three hundred thirty-one million, thirteen thousand, three hundred twelve".