31212113133 has 4 divisors (see below), whose sum is σ = 41616150848. Its totient is φ = 20808075420.

The previous prime is 31212113099. The next prime is 31212113167. The reversal of 31212113133 is 33131121213.

It is a happy number.

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 an interprime number because it is at equal distance from previous prime (31212113099) and next prime (31212113167).

It is not a de Polignac number, because 31212113133 - 2¹⁴ = 31212096749 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 (31212113633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5202018853 + ... + 5202018858.

It is an arithmetic number, because the mean of its divisors is an integer number (10404037712).

Almost surely, 2^31212113133 is an apocalyptic number.

It is an amenable number.

31212113133 is a deficient number, since it is larger than the sum of its proper divisors (10404037715).

31212113133 is a wasteful number, since it uses less digits than its factorization.

31212113133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10404037714.

The product of its digits is 324, while the sum is 21.

Adding to 31212113133 its reverse (33131121213), we get a palindrome (64343234346).

The spelling of 31212113133 in words is "thirty-one billion, two hundred twelve million, one hundred thirteen thousand, one hundred thirty-three".