22419721 has 2 divisors, whose sum is σ = 22419722. Its totient is φ = 22419720.

The previous prime is 22419713. The next prime is 22419739. The reversal of 22419721 is 12791422.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 10169721 = 3500^2 + 3189^2 .

It is a cyclic number.

It is not a de Polignac number, because 22419721 - 2³ = 22419713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22419721.

It is not a weakly prime, because it can be changed into another prime (22419421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11209860 + 11209861.

It is an arithmetic number, because the mean of its divisors is an integer number (11209861).

Almost surely, 2^22419721 is an apocalyptic number.

It is an amenable number.

22419721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22419721 is an equidigital number, since it uses as much as digits as its factorization.

22419721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 22419721 is about 4734.9467790040. The cubic root of 22419721 is about 281.9746510756.

The spelling of 22419721 in words is "twenty-two million, four hundred nineteen thousand, seven hundred twenty-one".