222323021 has 2 divisors, whose sum is σ = 222323022. Its totient is φ = 222323020.

The previous prime is 222323011. The next prime is 222323027. The reversal of 222323021 is 120323222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158482921 + 63840100 = 12589^2 + 7990^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222323021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222323027) 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, 111161510 + 111161511.

It is an arithmetic number, because the mean of its divisors is an integer number (111161511).

Almost surely, 2^222323021 is an apocalyptic number.

It is an amenable number.

222323021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222323021 is an equidigital number, since it uses as much as digits as its factorization.

222323021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 222323021 is about 14910.5003604842. The cubic root of 222323021 is about 605.7984322013.

Adding to 222323021 its reverse (120323222), we get a palindrome (342646243).

The spelling of 222323021 in words is "two hundred twenty-two million, three hundred twenty-three thousand, twenty-one".