22222022021 has 2 divisors, whose sum is σ = 22222022022. Its totient is φ = 22222022020.

The previous prime is 22222021999. The next prime is 22222022027. The reversal of 22222022021 is 12022022222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17086149796 + 5135872225 = 130714^2 + 71665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22222022021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22222022027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11111011010 + 11111011011.

It is an arithmetic number, because the mean of its divisors is an integer number (11111011011).

Almost surely, 2^22222022021 is an apocalyptic number.

It is an amenable number.

22222022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22222022021 is an equidigital number, since it uses as much as digits as its factorization.

22222022021 is an evil number, because the sum of its binary digits is even.

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

Adding to 22222022021 its reverse (12022022222), we get a palindrome (34244044243).

The spelling of 22222022021 in words is "twenty-two billion, two hundred twenty-two million, twenty-two thousand, twenty-one".