2306556921 has 4 divisors (see below), whose sum is σ = 3075409232. Its totient is φ = 1537704612.

The previous prime is 2306556887. The next prime is 2306556943. The reversal of 2306556921 is 1296556032.

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 not a de Polignac number, because 2306556921 - 2¹⁹ = 2306032633 is a prime.

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 2306556921.

It is not an unprimeable number, because it can be changed into a prime (2306556121) 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, 384426151 + ... + 384426156.

It is an arithmetic number, because the mean of its divisors is an integer number (768852308).

Almost surely, 2^2306556921 is an apocalyptic number.

It is an amenable number.

2306556921 is a deficient number, since it is larger than the sum of its proper divisors (768852311).

2306556921 is an equidigital number, since it uses as much as digits as its factorization.

2306556921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768852310.

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 2306556921 is about 48026.6272082477. The cubic root of 2306556921 is about 1321.2593049894.

The spelling of 2306556921 in words is "two billion, three hundred six million, five hundred fifty-six thousand, nine hundred twenty-one".