2131123211 has 16 divisors (see below), whose sum is σ = 2447677440. Its totient is φ = 1817623680.

The previous prime is 2131123207. The next prime is 2131123223. The reversal of 2131123211 is 1123211312.

It is a cyclic number.

It is not a de Polignac number, because 2131123211 - 2² = 2131123207 is a prime.

It is a super-2 number, since 2×2131123211² = 9083372280925901042, which contains 22 as substring.

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 2131123211.

It is not an unprimeable number, because it can be changed into a prime (2131123231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1565171 + ... + 1566531.

It is an arithmetic number, because the mean of its divisors is an integer number (152979840).

Almost surely, 2^2131123211 is an apocalyptic number.

2131123211 is a deficient number, since it is larger than the sum of its proper divisors (316554229).

2131123211 is a wasteful number, since it uses less digits than its factorization.

2131123211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2314.

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

The square root of 2131123211 is about 46164.0900592658. The cubic root of 2131123211 is about 1286.8744738572.

Adding to 2131123211 its reverse (1123211312), we get a palindrome (3254334523).

The spelling of 2131123211 in words is "two billion, one hundred thirty-one million, one hundred twenty-three thousand, two hundred eleven".