422221381 has 2 divisors, whose sum is σ = 422221382. Its totient is φ = 422221380.

The previous prime is 422221301. The next prime is 422221391. The reversal of 422221381 is 183122224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 235898881 + 186322500 = 15359^2 + 13650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-422221381 is a prime.

It is a super-2 number, since 2×422221381² = 356541789147094322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (422221301) 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, 211110690 + 211110691.

It is an arithmetic number, because the mean of its divisors is an integer number (211110691).

Almost surely, 2^422221381 is an apocalyptic number.

It is an amenable number.

422221381 is a deficient number, since it is larger than the sum of its proper divisors (1).

422221381 is an equidigital number, since it uses as much as digits as its factorization.

422221381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 25.

The square root of 422221381 is about 20548.0262069134. The cubic root of 422221381 is about 750.2052066633.

The spelling of 422221381 in words is "four hundred twenty-two million, two hundred twenty-one thousand, three hundred eighty-one".