31013212131331 has 4 divisors (see below), whose sum is σ = 31438050653752. Its totient is φ = 30588373608912.

The previous prime is 31013212131323. The next prime is 31013212131367. The reversal of 31013212131331 is 13313121231013.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31013212131331 - 2³ = 31013212131323 is a prime.

It is a super-2 number, since 2×31013212131331² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31013212131296 and 31013212131305.

It is not an unprimeable number, because it can be changed into a prime (31013212131301) 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, 212419261101 + ... + 212419261246.

It is an arithmetic number, because the mean of its divisors is an integer number (7859512663438).

Almost surely, 2^{31013212131331} is an apocalyptic number.

31013212131331 is a deficient number, since it is larger than the sum of its proper divisors (424838522421).

31013212131331 is an equidigital number, since it uses as much as digits as its factorization.

31013212131331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424838522420.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 31013212131331 its reverse (13313121231013), we get a palindrome (44326333362344).

The spelling of 31013212131331 in words is "thirty-one trillion, thirteen billion, two hundred twelve million, one hundred thirty-one thousand, three hundred thirty-one".