222405221 has 2 divisors, whose sum is σ = 222405222. Its totient is φ = 222405220.

The previous prime is 222405217. The next prime is 222405233. The reversal of 222405221 is 122504222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168220900 + 54184321 = 12970^2 + 7361^2 .

It is a cyclic number.

It is not a de Polignac number, because 222405221 - 2² = 222405217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 222405193 and 222405202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222405121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111202610 + 111202611.

It is an arithmetic number, because the mean of its divisors is an integer number (111202611).

Almost surely, 2^222405221 is an apocalyptic number.

It is an amenable number.

222405221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222405221 is an equidigital number, since it uses as much as digits as its factorization.

222405221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 222405221 is about 14913.2565524771. The cubic root of 222405221 is about 605.8730840825.

Adding to 222405221 its reverse (122504222), we get a palindrome (344909443).

Subtracting from 222405221 its reverse (122504222), we obtain a palindrome (99900999).

The spelling of 222405221 in words is "two hundred twenty-two million, four hundred five thousand, two hundred twenty-one".