2131165321 has 4 divisors (see below), whose sum is σ = 2176509312. Its totient is φ = 2085821332.

The previous prime is 2131165301. The next prime is 2131165403. The reversal of 2131165321 is 1235611312.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2131165321 - 2²¹ = 2129068169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131165301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22671925 + ... + 22672018.

It is an arithmetic number, because the mean of its divisors is an integer number (544127328).

Almost surely, 2^2131165321 is an apocalyptic number.

It is an amenable number.

2131165321 is a deficient number, since it is larger than the sum of its proper divisors (45343991).

2131165321 is an equidigital number, since it uses as much as digits as its factorization.

2131165321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45343990.

The product of its digits is 1080, while the sum is 25.

The square root of 2131165321 is about 46164.5461474496. The cubic root of 2131165321 is about 1286.8829498143.

Adding to 2131165321 its reverse (1235611312), we get a palindrome (3366776633).

The spelling of 2131165321 in words is "two billion, one hundred thirty-one million, one hundred sixty-five thousand, three hundred twenty-one".