222896021 has 2 divisors, whose sum is σ = 222896022. Its totient is φ = 222896020.

The previous prime is 222895999. The next prime is 222896033. The reversal of 222896021 is 120698222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182115025 + 40780996 = 13495^2 + 6386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222896021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222896081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111448010 + 111448011.

It is an arithmetic number, because the mean of its divisors is an integer number (111448011).

Almost surely, 2^222896021 is an apocalyptic number.

It is an amenable number.

222896021 is a deficient number, since it is larger than the sum of its proper divisors (1).

222896021 is an equidigital number, since it uses as much as digits as its factorization.

222896021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 222896021 is about 14929.7026427186. The cubic root of 222896021 is about 606.3184333987.

The spelling of 222896021 in words is "two hundred twenty-two million, eight hundred ninety-six thousand, twenty-one".