12311031321 has 40 divisors (see below), whose sum is σ = 19570636800. Its totient is φ = 7685580672.

The previous prime is 12311031307. The next prime is 12311031331. The reversal of 12311031321 is 12313011321.

12311031321 is a `hidden beast` number, since 1 + 2 + 311 + 0 + 31 + 321 = 666.

It is not a de Polignac number, because 12311031321 - 2¹³ = 12311023129 is a prime.

It is a super-2 number, since 2×12311031321² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12311031294 and 12311031303.

It is not an unprimeable number, because it can be changed into a prime (12311031331) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 251560 + ... + 296486.

It is an arithmetic number, because the mean of its divisors is an integer number (489265920).

Almost surely, 2^12311031321 is an apocalyptic number.

It is an amenable number.

12311031321 is a deficient number, since it is larger than the sum of its proper divisors (7259605479).

12311031321 is a wasteful number, since it uses less digits than its factorization.

12311031321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45155 (or 45146 counting only the distinct ones).

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

Adding to 12311031321 its reverse (12313011321), we get a palindrome (24624042642).

The spelling of 12311031321 in words is "twelve billion, three hundred eleven million, thirty-one thousand, three hundred twenty-one".