22450721 has 2 divisors, whose sum is σ = 22450722. Its totient is φ = 22450720.

The previous prime is 22450709. The next prime is 22450733. The reversal of 22450721 is 12705422.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (22450709) and next prime (22450733).

It can be written as a sum of positive squares in only one way, i.e., 22429696 + 21025 = 4736^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 22450721 - 2¹⁸ = 22188577 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (22450741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11225360 + 11225361.

It is an arithmetic number, because the mean of its divisors is an integer number (11225361).

Almost surely, 2^22450721 is an apocalyptic number.

It is an amenable number.

22450721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22450721 is an equidigital number, since it uses as much as digits as its factorization.

22450721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 22450721 is about 4738.2191802406. The cubic root of 22450721 is about 282.1045543932.

The spelling of 22450721 in words is "twenty-two million, four hundred fifty thousand, seven hundred twenty-one".