31331231202213 has 6 divisors (see below), whose sum is σ = 45256222847654. Its totient is φ = 20887487468136.

The previous prime is 31331231202199. The next prime is 31331231202247. The reversal of 31331231202213 is 31220213213313.

31331231202213 is a `hidden beast` number, since 3 + 1 + 3 + 312 + 3 + 120 + 221 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 22591598375844 + 8739632826369 = 4753062^2 + 2956287^2 .

It is not a de Polignac number, because 31331231202213 - 2²⁵ = 31331197647781 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 (31331231202253) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1740623955670 + ... + 1740623955687.

Almost surely, 2^{31331231202213} is an apocalyptic number.

It is an amenable number.

31331231202213 is a deficient number, since it is larger than the sum of its proper divisors (13924991645441).

31331231202213 is a wasteful number, since it uses less digits than its factorization.

31331231202213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3481247911363 (or 3481247911360 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 31331231202213 its reverse (31220213213313), we get a palindrome (62551444415526).

The spelling of 31331231202213 in words is "thirty-one trillion, three hundred thirty-one billion, two hundred thirty-one million, two hundred two thousand, two hundred thirteen".