2373991321 has 4 divisors (see below), whose sum is σ = 2556606052. Its totient is φ = 2191376592.

The previous prime is 2373991303. The next prime is 2373991327. The reversal of 2373991321 is 1231993732.

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 1416769600 + 957221721 = 37640^2 + 30939^2 .

It is a cyclic number.

It is not a de Polignac number, because 2373991321 - 2⁹ = 2373990809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2373991327) 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, 91307346 + ... + 91307371.

It is an arithmetic number, because the mean of its divisors is an integer number (639151513).

Almost surely, 2^2373991321 is an apocalyptic number.

It is an amenable number.

2373991321 is a deficient number, since it is larger than the sum of its proper divisors (182614731).

2373991321 is a wasteful number, since it uses less digits than its factorization.

2373991321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182614730.

The product of its digits is 61236, while the sum is 40.

The square root of 2373991321 is about 48723.6217968246. The cubic root of 2373991321 is about 1334.0119161618.

The spelling of 2373991321 in words is "two billion, three hundred seventy-three million, nine hundred ninety-one thousand, three hundred twenty-one".