31321132221331 has 16 divisors (see below), whose sum is σ = 32984338611616. Its totient is φ = 29710287737856.

The previous prime is 31321132221167. The next prime is 31321132221359. The reversal of 31321132221331 is 13312223112313.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321132221331 is a prime.

It is a super-2 number, since 2×31321132221331² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31321132221331.

It is not an unprimeable number, because it can be changed into a prime (31321132221031) 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, 64886256 + ... + 65367181.

It is an arithmetic number, because the mean of its divisors is an integer number (2061521163226).

Almost surely, 2^{31321132221331} is an apocalyptic number.

31321132221331 is a deficient number, since it is larger than the sum of its proper divisors (1663206390285).

31321132221331 is a wasteful number, since it uses less digits than its factorization.

31321132221331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130253638.

The product of its digits is 3888, while the sum is 28.

Adding to 31321132221331 its reverse (13312223112313), we get a palindrome (44633355333644).

The spelling of 31321132221331 in words is "thirty-one trillion, three hundred twenty-one billion, one hundred thirty-two million, two hundred twenty-one thousand, three hundred thirty-one".