31311302100213 has 4 divisors (see below), whose sum is σ = 41748402800288. Its totient is φ = 20874201400140.

The previous prime is 31311302100179. The next prime is 31311302100251. The reversal of 31311302100213 is 31200120311313.

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 not a de Polignac number, because 31311302100213 - 2³² = 31307007132917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31311302100213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311302104213) 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, 5218550350033 + ... + 5218550350038.

It is an arithmetic number, because the mean of its divisors is an integer number (10437100700072).

Almost surely, 2^{31311302100213} is an apocalyptic number.

It is an amenable number.

31311302100213 is a deficient number, since it is larger than the sum of its proper divisors (10437100700075).

31311302100213 is a wasteful number, since it uses less digits than its factorization.

31311302100213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10437100700074.

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

Adding to 31311302100213 its reverse (31200120311313), we get a palindrome (62511422411526).

The spelling of 31311302100213 in words is "thirty-one trillion, three hundred eleven billion, three hundred two million, one hundred thousand, two hundred thirteen".