23336840921 has 4 divisors (see below), whose sum is σ = 23381633844. Its totient is φ = 23292048000.

The previous prime is 23336840903. The next prime is 23336840939. The reversal of 23336840921 is 12904863332.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (23336840903) and next prime (23336840939).

It can be written as a sum of positive squares in 2 ways, for example, as 6697130896 + 16639710025 = 81836^2 + 128995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23336840921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23336843921) 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, 22395680 + ... + 22396721.

It is an arithmetic number, because the mean of its divisors is an integer number (5845408461).

Almost surely, 2^23336840921 is an apocalyptic number.

It is an amenable number.

23336840921 is a deficient number, since it is larger than the sum of its proper divisors (44792923).

23336840921 is an equidigital number, since it uses as much as digits as its factorization.

23336840921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44792922.

The product of its (nonzero) digits is 186624, while the sum is 41.

The spelling of 23336840921 in words is "twenty-three billion, three hundred thirty-six million, eight hundred forty thousand, nine hundred twenty-one".