2131121131 has 4 divisors (see below), whose sum is σ = 2140677952. Its totient is φ = 2121564312.

The previous prime is 2131121129. The next prime is 2131121147. The reversal of 2131121131 is 1311211312.

It is a happy number.

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 2131121131 - 2¹ = 2131121129 is a prime.

It is a super-2 number, since 2×2131121131² = 9083354549989438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131121731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4778076 + ... + 4778521.

It is an arithmetic number, because the mean of its divisors is an integer number (535169488).

Almost surely, 2^2131121131 is an apocalyptic number.

2131121131 is a deficient number, since it is larger than the sum of its proper divisors (9556821).

2131121131 is an equidigital number, since it uses as much as digits as its factorization.

2131121131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556820.

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

The square root of 2131121131 is about 46164.0675309271. The cubic root of 2131121131 is about 1286.8740551891.

Adding to 2131121131 its reverse (1311211312), we get a palindrome (3442332443).

It can be divided in two parts, 2 and 131121131, that multiplied together give a palindrome (262242262).

The spelling of 2131121131 in words is "two billion, one hundred thirty-one million, one hundred twenty-one thousand, one hundred thirty-one".