23021291 has 2 divisors, whose sum is σ = 23021292. Its totient is φ = 23021290.

The previous prime is 23021287. The next prime is 23021333. The reversal of 23021291 is 19212032.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23021291 - 2² = 23021287 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23021261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11510645 + 11510646.

It is an arithmetic number, because the mean of its divisors is an integer number (11510646).

Almost surely, 2^23021291 is an apocalyptic number.

23021291 is a deficient number, since it is larger than the sum of its proper divisors (1).

23021291 is an equidigital number, since it uses as much as digits as its factorization.

23021291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 23021291 is about 4798.0507500442. The cubic root of 23021291 is about 284.4744227652.

The spelling of 23021291 in words is "twenty-three million, twenty-one thousand, two hundred ninety-one".