422221993 has 2 divisors, whose sum is σ = 422221994. Its totient is φ = 422221992.

The previous prime is 422221981. The next prime is 422222051. The reversal of 422221993 is 399122224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 389193984 + 33028009 = 19728^2 + 5747^2 .

It is a cyclic number.

It is not a de Polignac number, because 422221993 - 2²¹ = 420124841 is a prime.

It is a super-2 number, since 2×422221993² = 356542822745784098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (422221193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211110996 + 211110997.

It is an arithmetic number, because the mean of its divisors is an integer number (211110997).

Almost surely, 2^422221993 is an apocalyptic number.

It is an amenable number.

422221993 is a deficient number, since it is larger than the sum of its proper divisors (1).

422221993 is an equidigital number, since it uses as much as digits as its factorization.

422221993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 422221993 is about 20548.0410988493. The cubic root of 422221993 is about 750.2055691314.

The spelling of 422221993 in words is "four hundred twenty-two million, two hundred twenty-one thousand, nine hundred ninety-three".