222001111022221 has 2 divisors, whose sum is σ = 222001111022222. Its totient is φ = 222001111022220.

The previous prime is 222001111022209. The next prime is 222001111022227. The reversal of 222001111022221 is 122220111100222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220611282234121 + 1389828788100 = 14852989^2 + 1178910^2 .

It is a cyclic number.

It is not a de Polignac number, because 222001111022221 - 2⁹ = 222001111021709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222001111022227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111000555511110 + 111000555511111.

It is an arithmetic number, because the mean of its divisors is an integer number (111000555511111).

Almost surely, 2^{222001111022221} is an apocalyptic number.

It is an amenable number.

222001111022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222001111022221 is an equidigital number, since it uses as much as digits as its factorization.

222001111022221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 222001111022221 its reverse (122220111100222), we get a palindrome (344221222122443).

The spelling of 222001111022221 in words is "two hundred twenty-two trillion, one billion, one hundred eleven million, twenty-two thousand, two hundred twenty-one".