2131121311 has 16 divisors (see below), whose sum is σ = 2359264896. Its totient is φ = 1908900000.

The previous prime is 2131121269. The next prime is 2131121387. The reversal of 2131121311 is 1131211312.

It is a happy number.

It is not a de Polignac number, because 2131121311 - 2⁷ = 2131121183 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 (2131127311) 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, 229876 + ... + 238966.

It is an arithmetic number, because the mean of its divisors is an integer number (147454056).

Almost surely, 2^2131121311 is an apocalyptic number.

2131121311 is a deficient number, since it is larger than the sum of its proper divisors (228143585).

2131121311 is a wasteful number, since it uses less digits than its factorization.

2131121311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9414.

The product of its digits is 36, while the sum is 16.

The square root of 2131121311 is about 46164.0694804953. The cubic root of 2131121311 is about 1286.8740914200.

Adding to 2131121311 its reverse (1131211312), we get a palindrome (3262332623).

Subtracting from 2131121311 its reverse (1131211312), we obtain a palindrome (999909999).

The spelling of 2131121311 in words is "two billion, one hundred thirty-one million, one hundred twenty-one thousand, three hundred eleven".