222668321 has 2 divisors, whose sum is σ = 222668322. Its totient is φ = 222668320.

The previous prime is 222668273. The next prime is 222668357. The reversal of 222668321 is 123866222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216237025 + 6431296 = 14705^2 + 2536^2 .

It is a cyclic number.

It is not a de Polignac number, because 222668321 - 2²² = 218474017 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (222668821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111334160 + 111334161.

It is an arithmetic number, because the mean of its divisors is an integer number (111334161).

Almost surely, 2^222668321 is an apocalyptic number.

It is an amenable number.

222668321 is a deficient number, since it is larger than the sum of its proper divisors (1).

222668321 is an equidigital number, since it uses as much as digits as its factorization.

222668321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 32.

The square root of 222668321 is about 14922.0749562519. The cubic root of 222668321 is about 606.1119010063. Note that the first 3 decimals are identical.

The spelling of 222668321 in words is "two hundred twenty-two million, six hundred sixty-eight thousand, three hundred twenty-one".