222221971 has 2 divisors, whose sum is σ = 222221972. Its totient is φ = 222221970.

The previous prime is 222221957. The next prime is 222222029. The reversal of 222221971 is 179122222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 222221971 - 2⁵ = 222221939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (222221921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110985 + 111110986.

It is an arithmetic number, because the mean of its divisors is an integer number (111110986).

Almost surely, 2^222221971 is an apocalyptic number.

222221971 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221971 is an equidigital number, since it uses as much as digits as its factorization.

222221971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 28.

The square root of 222221971 is about 14907.1114237467. Note that the first 3 decimals coincide. The cubic root of 222221971 is about 605.7066360268.

The spelling of 222221971 in words is "two hundred twenty-two million, two hundred twenty-one thousand, nine hundred seventy-one".