31213001121133 has 4 divisors (see below), whose sum is σ = 33614001207388. Its totient is φ = 28812001034880.

The previous prime is 31213001121121. The next prime is 31213001121157. The reversal of 31213001121133 is 33112110031213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8951986208169 + 22261014912964 = 2991987^2 + 4718158^2 .

It is a cyclic number.

It is not a de Polignac number, because 31213001121133 - 2²¹ = 31212999023981 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 (31213001121163) 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, 1200500043108 + ... + 1200500043133.

It is an arithmetic number, because the mean of its divisors is an integer number (8403500301847).

Almost surely, 2^{31213001121133} is an apocalyptic number.

It is an amenable number.

31213001121133 is a deficient number, since it is larger than the sum of its proper divisors (2401000086255).

31213001121133 is a wasteful number, since it uses less digits than its factorization.

31213001121133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401000086254.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 31213001121133 its reverse (33112110031213), we get a palindrome (64325111152346).

The spelling of 31213001121133 in words is "thirty-one trillion, two hundred thirteen billion, one million, one hundred twenty-one thousand, one hundred thirty-three".