22221649 has 2 divisors, whose sum is σ = 22221650. Its totient is φ = 22221648.

The previous prime is 22221599. The next prime is 22221691. The reversal of 22221649 is 94612222.

22221649 is nontrivially palindromic in base 16.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14493249 + 7728400 = 3807^2 + 2780^2 .

It is a cyclic number.

It is not a de Polignac number, because 22221649 - 2¹⁷ = 22090577 is a prime.

It is not a weakly prime, because it can be changed into another prime (22221049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110824 + 11110825.

It is an arithmetic number, because the mean of its divisors is an integer number (11110825).

Almost surely, 2^22221649 is an apocalyptic number.

It is an amenable number.

22221649 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221649 is an equidigital number, since it uses as much as digits as its factorization.

22221649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 28.

The square root of 22221649 is about 4713.9844081202. The cubic root of 22221649 is about 281.1418043747.

The spelling of 22221649 in words is "twenty-two million, two hundred twenty-one thousand, six hundred forty-nine".