222242021 has 2 divisors, whose sum is σ = 222242022. Its totient is φ = 222242020.

The previous prime is 222241997. The next prime is 222242029. The reversal of 222242021 is 120242222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 213568996 + 8673025 = 14614^2 + 2945^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222242021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222242029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111121010 + 111121011.

It is an arithmetic number, because the mean of its divisors is an integer number (111121011).

Almost surely, 2^222242021 is an apocalyptic number.

It is an amenable number.

222242021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222242021 is an equidigital number, since it uses as much as digits as its factorization.

222242021 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.

The square root of 222242021 is about 14907.7839064027. The cubic root of 222242021 is about 605.7248521266.

Adding to 222242021 its reverse (120242222), we get a palindrome (342484243).

The spelling of 222242021 in words is "two hundred twenty-two million, two hundred forty-two thousand, twenty-one".