222221200220161 has 2 divisors, whose sum is σ = 222221200220162. Its totient is φ = 222221200220160.

The previous prime is 222221200220011. The next prime is 222221200220177. The reversal of 222221200220161 is 161022002122222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150644202638400 + 71576997581761 = 12273720^2 + 8460319^2 .

It is a cyclic number.

It is not a de Polignac number, because 222221200220161 - 2⁴¹ = 220022176964609 is a prime.

It is not a weakly prime, because it can be changed into another prime (222221200226161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111110600110080 + 111110600110081.

It is an arithmetic number, because the mean of its divisors is an integer number (111110600110081).

Almost surely, 2^{222221200220161} is an apocalyptic number.

It is an amenable number.

222221200220161 is a deficient number, since it is larger than the sum of its proper divisors (1).

222221200220161 is an equidigital number, since it uses as much as digits as its factorization.

222221200220161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 25.

Adding to 222221200220161 its reverse (161022002122222), we get a palindrome (383243202342383).

The spelling of 222221200220161 in words is "two hundred twenty-two trillion, two hundred twenty-one billion, two hundred million, two hundred twenty thousand, one hundred sixty-one".