22420291 has 2 divisors, whose sum is σ = 22420292. Its totient is φ = 22420290.

The previous prime is 22420267. The next prime is 22420313. The reversal of 22420291 is 19202422.

It is an a-pointer prime, because the next prime (22420313) can be obtained adding 22420291 to its sum of digits (22).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22420291 - 2⁵ = 22420259 is a prime.

It is not a weakly prime, because it can be changed into another prime (22420201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11210145 + 11210146.

It is an arithmetic number, because the mean of its divisors is an integer number (11210146).

Almost surely, 2^22420291 is an apocalyptic number.

22420291 is a deficient number, since it is larger than the sum of its proper divisors (1).

22420291 is an equidigital number, since it uses as much as digits as its factorization.

22420291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 22420291 is about 4735.0069693719. The cubic root of 22420291 is about 281.9770407008.

The spelling of 22420291 in words is "twenty-two million, four hundred twenty thousand, two hundred ninety-one".