2343656721 has 24 divisors (see below), whose sum is σ = 3760413120. Its totient is φ = 1293049632.

The previous prime is 2343656713. The next prime is 2343656723. The reversal of 2343656721 is 1276563432.

It is not a de Polignac number, because 2343656721 - 2³ = 2343656713 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 2343656721.

It is not an unprimeable number, because it can be changed into a prime (2343656723) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270621 + ... + 279146.

It is an arithmetic number, because the mean of its divisors is an integer number (156683880).

Almost surely, 2^2343656721 is an apocalyptic number.

2343656721 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2343656721 is a deficient number, since it is larger than the sum of its proper divisors (1416756399).

2343656721 is a wasteful number, since it uses less digits than its factorization.

2343656721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549813 (or 549806 counting only the distinct ones).

The product of its digits is 181440, while the sum is 39.

The square root of 2343656721 is about 48411.3284366376. The cubic root of 2343656721 is about 1328.3055892483.

The spelling of 2343656721 in words is "two billion, three hundred forty-three million, six hundred fifty-six thousand, seven hundred twenty-one".