31213122013 has 16 divisors (see below), whose sum is σ = 32300384256. Its totient is φ = 30144390640.

The previous prime is 31213121987. The next prime is 31213122023. The reversal of 31213122013 is 31022131213.

It is a cyclic number.

It is not a de Polignac number, because 31213122013 - 2⁵ = 31213121981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31213122023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3549420 + ... + 3558202.

It is an arithmetic number, because the mean of its divisors is an integer number (2018774016).

Almost surely, 2^31213122013 is an apocalyptic number.

It is an amenable number.

31213122013 is a deficient number, since it is larger than the sum of its proper divisors (1087262243).

31213122013 is an equidigital number, since it uses as much as digits as its factorization.

31213122013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9824.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31213122013 its reverse (31022131213), we get a palindrome (62235253226).

The spelling of 31213122013 in words is "thirty-one billion, two hundred thirteen million, one hundred twenty-two thousand, thirteen".