222421321 has 2 divisors, whose sum is σ = 222421322. Its totient is φ = 222421320.

The previous prime is 222421313. The next prime is 222421333. The reversal of 222421321 is 123124222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114490000 + 107931321 = 10700^2 + 10389^2 .

It is a cyclic number.

It is not a de Polignac number, because 222421321 - 2³ = 222421313 is a prime.

It is not a weakly prime, because it can be changed into another prime (222421301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111210660 + 111210661.

It is an arithmetic number, because the mean of its divisors is an integer number (111210661).

Almost surely, 2^222421321 is an apocalyptic number.

It is an amenable number.

222421321 is a deficient number, since it is larger than the sum of its proper divisors (1).

222421321 is an equidigital number, since it uses as much as digits as its factorization.

222421321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 19.

The square root of 222421321 is about 14913.7963309145. The cubic root of 222421321 is about 605.8877035254.

Adding to 222421321 its reverse (123124222), we get a palindrome (345545543).

The spelling of 222421321 in words is "two hundred twenty-two million, four hundred twenty-one thousand, three hundred twenty-one".