222144324221 has 2 divisors, whose sum is σ = 222144324222. Its totient is φ = 222144324220.

The previous prime is 222144324197. The next prime is 222144324239. The reversal of 222144324221 is 122423441222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181594447321 + 40549876900 = 426139^2 + 201370^2 .

It is a cyclic number.

It is not a de Polignac number, because 222144324221 - 2²² = 222140129917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222144324821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111072162110 + 111072162111.

It is an arithmetic number, because the mean of its divisors is an integer number (111072162111).

Almost surely, 2^222144324221 is an apocalyptic number.

It is an amenable number.

222144324221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222144324221 is an equidigital number, since it uses as much as digits as its factorization.

222144324221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12288, while the sum is 29.

Adding to 222144324221 its reverse (122423441222), we get a palindrome (344567765443).

The spelling of 222144324221 in words is "two hundred twenty-two billion, one hundred forty-four million, three hundred twenty-four thousand, two hundred twenty-one".