222121110221 has 2 divisors, whose sum is σ = 222121110222. Its totient is φ = 222121110220.

The previous prime is 222121110187. The next prime is 222121110229. The reversal of 222121110221 is 122011121222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212415904996 + 9705205225 = 460886^2 + 98515^2 .

It is a cyclic number.

It is not a de Polignac number, because 222121110221 - 2¹⁴ = 222121093837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 222121110221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222121110229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111060555110 + 111060555111.

It is an arithmetic number, because the mean of its divisors is an integer number (111060555111).

Almost surely, 2^222121110221 is an apocalyptic number.

It is an amenable number.

222121110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222121110221 is an equidigital number, since it uses as much as digits as its factorization.

222121110221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 222121110221 its reverse (122011121222), we get a palindrome (344132231443).

The spelling of 222121110221 in words is "two hundred twenty-two billion, one hundred twenty-one million, one hundred ten thousand, two hundred twenty-one".