22224022721 has 2 divisors, whose sum is σ = 22224022722. Its totient is φ = 22224022720.

The previous prime is 22224022649. The next prime is 22224022739. The reversal of 22224022721 is 12722042222.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21276306496 + 947716225 = 145864^2 + 30785^2 .

It is a cyclic number.

It is not a de Polignac number, because 22224022721 - 2²² = 22219828417 is a prime.

It is not a weakly prime, because it can be changed into another prime (22224022741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11112011360 + 11112011361.

It is an arithmetic number, because the mean of its divisors is an integer number (11112011361).

Almost surely, 2^22224022721 is an apocalyptic number.

It is an amenable number.

22224022721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22224022721 is an equidigital number, since it uses as much as digits as its factorization.

22224022721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3584, while the sum is 26.

Adding to 22224022721 its reverse (12722042222), we get a palindrome (34946064943).

The spelling of 22224022721 in words is "twenty-two billion, two hundred twenty-four million, twenty-two thousand, seven hundred twenty-one".