2309090921 has 4 divisors (see below), whose sum is σ = 2338320000. Its totient is φ = 2279861844.

The previous prime is 2309090879. The next prime is 2309090933. The reversal of 2309090921 is 1290909032.

2309090921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2309090921 - 2¹⁰ = 2309089897 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2309090951) 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, 14614421 + ... + 14614578.

It is an arithmetic number, because the mean of its divisors is an integer number (584580000).

Almost surely, 2^2309090921 is an apocalyptic number.

It is an amenable number.

2309090921 is a deficient number, since it is larger than the sum of its proper divisors (29229079).

2309090921 is an equidigital number, since it uses as much as digits as its factorization.

2309090921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29229078.

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 2309090921 is about 48053.0011653799. The cubic root of 2309090921 is about 1321.7429762318.

Adding to 2309090921 its reverse (1290909032), we get a palindrome (3599999953).

The spelling of 2309090921 in words is "two billion, three hundred nine million, ninety thousand, nine hundred twenty-one".