23015921 has 2 divisors, whose sum is σ = 23015922. Its totient is φ = 23015920.

The previous prime is 23015917. The next prime is 23015929. The reversal of 23015921 is 12951032.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22800625 + 215296 = 4775^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 23015921 - 2² = 23015917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23015929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11507960 + 11507961.

It is an arithmetic number, because the mean of its divisors is an integer number (11507961).

Almost surely, 2^23015921 is an apocalyptic number.

It is an amenable number.

23015921 is a deficient number, since it is larger than the sum of its proper divisors (1).

23015921 is an equidigital number, since it uses as much as digits as its factorization.

23015921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 23015921 is about 4797.4911151559. The cubic root of 23015921 is about 284.4523019895.

Adding to 23015921 its reverse (12951032), we get a palindrome (35966953).

The spelling of 23015921 in words is "twenty-three million, fifteen thousand, nine hundred twenty-one".