222424424221 has 2 divisors, whose sum is σ = 222424424222. Its totient is φ = 222424424220.

The previous prime is 222424424177. The next prime is 222424424231. The reversal of 222424424221 is 122424424222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124573702500 + 97850721721 = 352950^2 + 312811^2 .

It is a cyclic number.

It is not a de Polignac number, because 222424424221 - 2¹³ = 222424416029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222424424231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111212212110 + 111212212111.

It is an arithmetic number, because the mean of its divisors is an integer number (111212212111).

Almost surely, 2^222424424221 is an apocalyptic number.

It is an amenable number.

222424424221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222424424221 is an equidigital number, since it uses as much as digits as its factorization.

222424424221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32768, while the sum is 31.

Adding to 222424424221 its reverse (122424424222), we get a palindrome (344848848443).

Subtracting from 222424424221 its reverse (122424424222), we obtain a palindrome (99999999999).

The spelling of 222424424221 in words is "two hundred twenty-two billion, four hundred twenty-four million, four hundred twenty-four thousand, two hundred twenty-one".