31213013133 has 4 divisors (see below), whose sum is σ = 41617350848. Its totient is φ = 20808675420.

The previous prime is 31213013119. The next prime is 31213013137. The reversal of 31213013133 is 33131031213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31213013133 - 2⁵ = 31213013101 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 (31213013137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5202168853 + ... + 5202168858.

It is an arithmetic number, because the mean of its divisors is an integer number (10404337712).

Almost surely, 2^31213013133 is an apocalyptic number.

It is an amenable number.

31213013133 is a deficient number, since it is larger than the sum of its proper divisors (10404337715).

31213013133 is a wasteful number, since it uses less digits than its factorization.

31213013133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10404337714.

The product of its (nonzero) digits is 486, while the sum is 21.

Adding to 31213013133 its reverse (33131031213), we get a palindrome (64344044346).

The spelling of 31213013133 in words is "thirty-one billion, two hundred thirteen million, thirteen thousand, one hundred thirty-three".