2131132121 has 4 divisors (see below), whose sum is σ = 2256492852. Its totient is φ = 2005771392.

The previous prime is 2131132117. The next prime is 2131132141. The reversal of 2131132121 is 1212311312.

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

It can be written as a sum of positive squares in 2 ways, for example, as 693584896 + 1437547225 = 26336^2 + 37915^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131132121 - 2² = 2131132117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 125360713 = 2131132121 / (2 + 1 + 3 + 1 + 1 + 3 + 2 + 1 + 2 + 1).

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 2131132121.

It is not an unprimeable number, because it can be changed into a prime (2131132141) 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, 62680340 + ... + 62680373.

It is an arithmetic number, because the mean of its divisors is an integer number (564123213).

Almost surely, 2^2131132121 is an apocalyptic number.

It is an amenable number.

2131132121 is a deficient number, since it is larger than the sum of its proper divisors (125360731).

2131132121 is a wasteful number, since it uses less digits than its factorization.

2131132121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125360730.

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

The square root of 2131132121 is about 46164.1865627458. The cubic root of 2131132121 is about 1286.8762672832.

Adding to 2131132121 its reverse (1212311312), we get a palindrome (3343443433).

The spelling of 2131132121 in words is "two billion, one hundred thirty-one million, one hundred thirty-two thousand, one hundred twenty-one".