2131312213 has 4 divisors (see below), whose sum is σ = 2243486560. Its totient is φ = 2019137868.

The previous prime is 2131312163. The next prime is 2131312223. The reversal of 2131312213 is 3122131312.

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 2131312213 - 2⁹ = 2131311701 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 112174327 = 2131312213 / (2 + 1 + 3 + 1 + 3 + 1 + 2 + 2 + 1 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131312223) 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, 56087145 + ... + 56087182.

It is an arithmetic number, because the mean of its divisors is an integer number (560871640).

Almost surely, 2^2131312213 is an apocalyptic number.

It is an amenable number.

2131312213 is a deficient number, since it is larger than the sum of its proper divisors (112174347).

2131312213 is a wasteful number, since it uses less digits than its factorization.

2131312213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112174346.

The product of its digits is 216, while the sum is 19.

The square root of 2131312213 is about 46166.1370811984. The cubic root of 2131312213 is about 1286.9125155587.

Adding to 2131312213 its reverse (3122131312), we get a palindrome (5253443525).

The spelling of 2131312213 in words is "two billion, one hundred thirty-one million, three hundred twelve thousand, two hundred thirteen".