2113212131 has 4 divisors (see below), whose sum is σ = 2153084112. Its totient is φ = 2073340152.

The previous prime is 2113212113. The next prime is 2113212133. The reversal of 2113212131 is 1312123112.

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

It is a cyclic number.

It is not a de Polignac number, because 2113212131 - 2³⁰ = 1039470307 is a prime.

It is a super-2 number, since 2×2113212131² = 8931331021211122322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2113212133) 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, 19935911 + ... + 19936016.

It is an arithmetic number, because the mean of its divisors is an integer number (538271028).

Almost surely, 2^2113212131 is an apocalyptic number.

2113212131 is a deficient number, since it is larger than the sum of its proper divisors (39871981).

2113212131 is an equidigital number, since it uses as much as digits as its factorization.

2113212131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39871980.

The product of its digits is 72, while the sum is 17.

The square root of 2113212131 is about 45969.6870883412. The cubic root of 2113212131 is about 1283.2591365585.

Adding to 2113212131 its reverse (1312123112), we get a palindrome (3425335243).

The spelling of 2113212131 in words is "two billion, one hundred thirteen million, two hundred twelve thousand, one hundred thirty-one".