2131231111213 has 4 divisors (see below), whose sum is σ = 2167353672480. Its totient is φ = 2095108549948.

The previous prime is 2131231111211. The next prime is 2131231111307. The reversal of 2131231111213 is 3121111321312.

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 a cyclic number.

It is not a de Polignac number, because 2131231111213 - 2¹ = 2131231111211 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 (2131231111211) 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, 18061280545 + ... + 18061280662.

It is an arithmetic number, because the mean of its divisors is an integer number (541838418120).

Almost surely, 2^{2131231111213} is an apocalyptic number.

It is an amenable number.

2131231111213 is a deficient number, since it is larger than the sum of its proper divisors (36122561267).

2131231111213 is an equidigital number, since it uses as much as digits as its factorization.

2131231111213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36122561266.

The product of its digits is 216, while the sum is 22.

Adding to 2131231111213 its reverse (3121111321312), we get a palindrome (5252342432525).

The spelling of 2131231111213 in words is "two trillion, one hundred thirty-one billion, two hundred thirty-one million, one hundred eleven thousand, two hundred thirteen".