23221091 has 2 divisors, whose sum is σ = 23221092. Its totient is φ = 23221090.

The previous prime is 23221087. The next prime is 23221103. The reversal of 23221091 is 19012232.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23221091 - 2² = 23221087 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 (23221291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11610545 + 11610546.

It is an arithmetic number, because the mean of its divisors is an integer number (11610546).

Almost surely, 2^23221091 is an apocalyptic number.

23221091 is a deficient number, since it is larger than the sum of its proper divisors (1).

23221091 is an equidigital number, since it uses as much as digits as its factorization.

23221091 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 23221091 is about 4818.8267244216. The cubic root of 23221091 is about 285.2950304815.

The spelling of 23221091 in words is "twenty-three million, two hundred twenty-one thousand, ninety-one".