222642421 has 8 divisors (see below), whose sum is σ = 236559960. Its totient is φ = 209541184.

The previous prime is 222642401. The next prime is 222642449. The reversal of 222642421 is 124246222.

It can be written as a sum of positive squares in 4 ways, for example, as 30404196 + 192238225 = 5514^2 + 13865^2 .

It is not a de Polignac number, because 222642421 - 2⁵ = 222642389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222642401) 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 in 7 ways as a sum of consecutive naturals, for example, 17746 + ... + 27571.

It is an arithmetic number, because the mean of its divisors is an integer number (29569995).

Almost surely, 2^222642421 is an apocalyptic number.

It is an amenable number.

222642421 is a deficient number, since it is larger than the sum of its proper divisors (13917539).

222642421 is an frugal number, since it uses more digits than its factorization.

222642421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45368 (or 45334 counting only the distinct ones).

The product of its digits is 3072, while the sum is 25.

The square root of 222642421 is about 14921.2070892405. The cubic root of 222642421 is about 606.0883998233.

Adding to 222642421 its reverse (124246222), we get a palindrome (346888643).

The spelling of 222642421 in words is "two hundred twenty-two million, six hundred forty-two thousand, four hundred twenty-one".