22459721 has 2 divisors, whose sum is σ = 22459722. Its totient is φ = 22459720.

The previous prime is 22459711. The next prime is 22459741. The reversal of 22459721 is 12795422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22458121 + 1600 = 4739^2 + 40^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22459721 is a prime.

It is not a weakly prime, because it can be changed into another prime (22459711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11229860 + 11229861.

It is an arithmetic number, because the mean of its divisors is an integer number (11229861).

Almost surely, 2^22459721 is an apocalyptic number.

It is an amenable number.

22459721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22459721 is an equidigital number, since it uses as much as digits as its factorization.

22459721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 22459721 is about 4739.1688089791. The cubic root of 22459721 is about 282.1422458598.

The spelling of 22459721 in words is "twenty-two million, four hundred fifty-nine thousand, seven hundred twenty-one".