22221949 has 2 divisors, whose sum is σ = 22221950. Its totient is φ = 22221948.

The previous prime is 22221911. The next prime is 22221971. The reversal of 22221949 is 94912222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20025625 + 2196324 = 4475^2 + 1482^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22221949 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22221949.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110974 + 11110975.

It is an arithmetic number, because the mean of its divisors is an integer number (11110975).

Almost surely, 2^22221949 is an apocalyptic number.

It is an amenable number.

22221949 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221949 is an equidigital number, since it uses as much as digits as its factorization.

22221949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 31.

The square root of 22221949 is about 4714.0162282283. The cubic root of 22221949 is about 281.1430695398.

The spelling of 22221949 in words is "twenty-two million, two hundred twenty-one thousand, nine hundred forty-nine".