22222198021 has 2 divisors, whose sum is σ = 22222198022. Its totient is φ = 22222198020.

The previous prime is 22222198013. The next prime is 22222198051. The reversal of 22222198021 is 12089122222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22018108225 + 204089796 = 148385^2 + 14286^2 .

It is a cyclic number.

It is not a de Polignac number, because 22222198021 - 2³ = 22222198013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22222198051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11111099010 + 11111099011.

It is an arithmetic number, because the mean of its divisors is an integer number (11111099011).

Almost surely, 2^22222198021 is an apocalyptic number.

It is an amenable number.

22222198021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22222198021 is an equidigital number, since it uses as much as digits as its factorization.

22222198021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 22222198021 in words is "twenty-two billion, two hundred twenty-two million, one hundred ninety-eight thousand, twenty-one".