22021218949 has 2 divisors, whose sum is σ = 22021218950. Its totient is φ = 22021218948.

The previous prime is 22021218943. The next prime is 22021218977. The reversal of 22021218949 is 94981212022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12008214724 + 10013004225 = 109582^2 + 100065^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021218949 - 2⁵ = 22021218917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22021218943) 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, 11010609474 + 11010609475.

It is an arithmetic number, because the mean of its divisors is an integer number (11010609475).

Almost surely, 2^22021218949 is an apocalyptic number.

It is an amenable number.

22021218949 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021218949 is an equidigital number, since it uses as much as digits as its factorization.

22021218949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 40.

The spelling of 22021218949 in words is "twenty-two billion, twenty-one million, two hundred eighteen thousand, nine hundred forty-nine".