31321244013213 has 16 divisors (see below), whose sum is σ = 52066483554816. Its totient is φ = 16270776110640.

The previous prime is 31321244013161. The next prime is 31321244013221. The reversal of 31321244013213 is 31231044212313.

It is not a de Polignac number, because 31321244013213 - 2¹² = 31321244009117 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31321244013253) 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, 67794900231 + ... + 67794900692.

It is an arithmetic number, because the mean of its divisors is an integer number (3254155222176).

Almost surely, 2^{31321244013213} is an apocalyptic number.

31321244013213 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31321244013213 is a deficient number, since it is larger than the sum of its proper divisors (20745239541603).

31321244013213 is a wasteful number, since it uses less digits than its factorization.

31321244013213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135589800944.

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 31321244013213 its reverse (31231044212313), we get a palindrome (62552288225526).

The spelling of 31321244013213 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred forty-four million, thirteen thousand, two hundred thirteen".