31100131321 has 4 divisors (see below), whose sum is σ = 35543007232. Its totient is φ = 26657255412.

The previous prime is 31100131319. The next prime is 31100131327. The reversal of 31100131321 is 12313100113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12313100113 = 1087 ⋅11327599.

It is a cyclic number.

It is not a de Polignac number, because 31100131321 - 2¹ = 31100131319 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31100131295 and 31100131304.

It is not an unprimeable number, because it can be changed into a prime (31100131327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2221437945 + ... + 2221437958.

It is an arithmetic number, because the mean of its divisors is an integer number (8885751808).

Almost surely, 2^31100131321 is an apocalyptic number.

It is an amenable number.

31100131321 is a deficient number, since it is larger than the sum of its proper divisors (4442875911).

31100131321 is an equidigital number, since it uses as much as digits as its factorization.

31100131321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4442875910.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 31100131321 its reverse (12313100113), we get a palindrome (43413231434).

The spelling of 31100131321 in words is "thirty-one billion, one hundred million, one hundred thirty-one thousand, three hundred twenty-one".