22222202021 has 2 divisors, whose sum is σ = 22222202022. Its totient is φ = 22222202020.

The previous prime is 22222202011. The next prime is 22222202027. The reversal of 22222202021 is 12020222222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18146784100 + 4075417921 = 134710^2 + 63839^2 .

It is a cyclic number.

It is not a de Polignac number, because 22222202021 - 2⁶ = 22222201957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22222202027) 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, 11111101010 + 11111101011.

It is an arithmetic number, because the mean of its divisors is an integer number (11111101011).

Almost surely, 2^22222202021 is an apocalyptic number.

It is an amenable number.

22222202021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22222202021 is an equidigital number, since it uses as much as digits as its factorization.

22222202021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 17.

Adding to 22222202021 its reverse (12020222222), we get a palindrome (34242424243).

The spelling of 22222202021 in words is "twenty-two billion, two hundred twenty-two million, two hundred two thousand, twenty-one".