2343291721 has 4 divisors (see below), whose sum is σ = 2348419732. Its totient is φ = 2338163712.

The previous prime is 2343291707. The next prime is 2343291787. The reversal of 2343291721 is 1271923432.

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 1366041600 + 977250121 = 36960^2 + 31261^2 .

It is a cyclic number.

It is not a de Polignac number, because 2343291721 - 2⁵ = 2343291689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2343291791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2563320 + ... + 2564233.

It is an arithmetic number, because the mean of its divisors is an integer number (587104933).

Almost surely, 2^2343291721 is an apocalyptic number.

It is an amenable number.

2343291721 is a deficient number, since it is larger than the sum of its proper divisors (5128011).

2343291721 is an equidigital number, since it uses as much as digits as its factorization.

2343291721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5128010.

The product of its digits is 18144, while the sum is 34.

The square root of 2343291721 is about 48407.5585110425. The cubic root of 2343291721 is about 1328.2366291048.

The spelling of 2343291721 in words is "two billion, three hundred forty-three million, two hundred ninety-one thousand, seven hundred twenty-one".