21331613312 has 32 divisors (see below), whose sum is σ = 43216869600. Its totient is φ = 10485026560.

The previous prime is 21331613299. The next prime is 21331613321.

21331613312 is nontrivially palindromic in base 10.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1404764 + ... + 1419867.

It is an arithmetic number, because the mean of its divisors is an integer number (1350527175).

Almost surely, 2^21331613312 is an apocalyptic number.

It is an amenable number.

21331613312 is an abundant number, since it is smaller than the sum of its proper divisors (21885256288).

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

21331613312 is an equidigital number, since it uses as much as digits as its factorization.

21331613312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2824704 (or 2824692 counting only the distinct ones).

The product of its digits is 1944, while the sum is 26.

The spelling of 21331613312 in words is "twenty-one billion, three hundred thirty-one million, six hundred thirteen thousand, three hundred twelve".