31323120013213 has 32 divisors (see below), whose sum is σ = 36937932595200. Its totient is φ = 26008296415296.

The previous prime is 31323120013193. The next prime is 31323120013247. The reversal of 31323120013213 is 31231002132313.

It is a cyclic number.

It is not a de Polignac number, because 31323120013213 - 2¹⁷ = 31323119882141 is a prime.

It is a super-2 number, since 2×31323120013213² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323120073213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12160020 + ... + 14509042.

It is an arithmetic number, because the mean of its divisors is an integer number (1154310393600).

Almost surely, 2^{31323120013213} is an apocalyptic number.

It is an amenable number.

31323120013213 is a deficient number, since it is larger than the sum of its proper divisors (5614812581987).

31323120013213 is a wasteful number, since it uses less digits than its factorization.

31323120013213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2349561.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31323120013213 its reverse (31231002132313), we get a palindrome (62554122145526).

The spelling of 31323120013213 in words is "thirty-one trillion, three hundred twenty-three billion, one hundred twenty million, thirteen thousand, two hundred thirteen".