31216566561213 has 16 divisors (see below), whose sum is σ = 46971636206400. Its totient is φ = 18266747412480.

The previous prime is 31216566561197. The next prime is 31216566561337.

31216566561213 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 31216566561213 - 2⁴ = 31216566561197 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31216566561013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16309594948 + ... + 16309596861.

It is an arithmetic number, because the mean of its divisors is an integer number (2935727262900).

Almost surely, 2^{31216566561213} is an apocalyptic number.

31216566561213 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

31216566561213 is a deficient number, since it is larger than the sum of its proper divisors (15755069645187).

31216566561213 is a wasteful number, since it uses less digits than its factorization.

31216566561213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32619191852.

The product of its digits is 1166400, while the sum is 48.

It can be divided in two parts, 3121656 and 6561213, that added together give a palindrome (9682869).

The spelling of 31216566561213 in words is "thirty-one trillion, two hundred sixteen billion, five hundred sixty-six million, five hundred sixty-one thousand, two hundred thirteen".