21031112331 has 24 divisors (see below), whose sum is σ = 32016770240. Its totient is φ = 13266342000.

The previous prime is 21031112321. The next prime is 21031112363. The reversal of 21031112331 is 13321113012.

21031112331 is a `hidden beast` number, since 2 + 10 + 311 + 12 + 331 = 666.

It is not a de Polignac number, because 21031112331 - 2⁵ = 21031112299 is a prime.

It is a super-2 number, since 2×21031112331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21031112321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62856 + ... + 214506.

Almost surely, 2^21031112331 is an apocalyptic number.

21031112331 is a deficient number, since it is larger than the sum of its proper divisors (10985657909).

21031112331 is a wasteful number, since it uses less digits than its factorization.

21031112331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152487 (or 152484 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21031112331 its reverse (13321113012), we get a palindrome (34352225343).

The spelling of 21031112331 in words is "twenty-one billion, thirty-one million, one hundred twelve thousand, three hundred thirty-one".