31213031213 has 40 divisors (see below), whose sum is σ = 39606296856. Its totient is φ = 24449040000.

The previous prime is 31213031189. The next prime is 31213031231.

31213031213 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 15514695364 + 15698335849 = 124558^2 + 125293^2 .

It is not a de Polignac number, because 31213031213 - 2¹⁶ = 31212965677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213031233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3147563 + ... + 3157463.

Almost surely, 2^31213031213 is an apocalyptic number.

It is an amenable number.

31213031213 is a deficient number, since it is larger than the sum of its proper divisors (8393265643).

31213031213 is an equidigital number, since it uses as much as digits as its factorization.

31213031213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10043 (or 10022 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

It can be divided in two parts, 312130 and 31213, that added together give a palindrome (343343).

The spelling of 31213031213 in words is "thirty-one billion, two hundred thirteen million, thirty-one thousand, two hundred thirteen".