21312332331 has 16 divisors (see below), whose sum is σ = 28607846400. Its totient is φ = 14112806400.

The previous prime is 21312332309. The next prime is 21312332333. The reversal of 21312332331 is 13323321312.

It is not a de Polignac number, because 21312332331 - 2²¹ = 21310235179 is a prime.

It is a super-2 number, since 2×21312332331² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21312332333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264906 + ... + 335856.

It is an arithmetic number, because the mean of its divisors is an integer number (1787990400).

Almost surely, 2^21312332331 is an apocalyptic number.

21312332331 is a deficient number, since it is larger than the sum of its proper divisors (7295514069).

21312332331 is a wasteful number, since it uses less digits than its factorization.

21312332331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71626.

The product of its digits is 1944, while the sum is 24.

Adding to 21312332331 its reverse (13323321312), we get a palindrome (34635653643).

The spelling of 21312332331 in words is "twenty-one billion, three hundred twelve million, three hundred thirty-two thousand, three hundred thirty-one".