31213535133213 has 24 divisors (see below), whose sum is σ = 46901478405600. Its totient is φ = 19979228006304.

The previous prime is 31213535133203. The next prime is 31213535133217. The reversal of 31213535133213 is 31233153531213.

31213535133213 is a `hidden beast` number, since 3 + 1 + 2 + 135 + 3 + 513 + 3 + 2 + 1 + 3 = 666.

It is not a de Polignac number, because 31213535133213 - 2⁸ = 31213535132957 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 (31213535133217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 334009395 + ... + 334102832.

It is an arithmetic number, because the mean of its divisors is an integer number (1954228266900).

Almost surely, 2^{31213535133213} is an apocalyptic number.

It is an amenable number.

31213535133213 is a deficient number, since it is larger than the sum of its proper divisors (15687943272387).

31213535133213 is a wasteful number, since it uses less digits than its factorization.

31213535133213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668112441 (or 668112438 counting only the distinct ones).

The product of its digits is 72900, while the sum is 36.

Adding to 31213535133213 its reverse (31233153531213), we get a palindrome (62446688664426).

The spelling of 31213535133213 in words is "thirty-one trillion, two hundred thirteen billion, five hundred thirty-five million, one hundred thirty-three thousand, two hundred thirteen".