222124222421221 has 2 divisors, whose sum is σ = 222124222421222. Its totient is φ = 222124222421220.

The previous prime is 222124222421201. The next prime is 222124222421239. The reversal of 222124222421221 is 122124222421222.

222124222421221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181242648844321 + 40881573576900 = 13462639^2 + 6393870^2 .

It is a cyclic number.

It is not a de Polignac number, because 222124222421221 - 2⁷ = 222124222421093 is a prime.

It is a super-2 number, since 2×222124222421221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (222124222421201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111062111210610 + 111062111210611.

It is an arithmetic number, because the mean of its divisors is an integer number (111062111210611).

Almost surely, 2^{222124222421221} is an apocalyptic number.

It is an amenable number.

222124222421221 is a deficient number, since it is larger than the sum of its proper divisors (1).

222124222421221 is an equidigital number, since it uses as much as digits as its factorization.

222124222421221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16384, while the sum is 31.

Adding to 222124222421221 its reverse (122124222421222), we get a palindrome (344248444842443).

Subtracting from 222124222421221 its reverse (122124222421222), we obtain a palindrome (99999999999999).

The spelling of 222124222421221 in words is "two hundred twenty-two trillion, one hundred twenty-four billion, two hundred twenty-two million, four hundred twenty-one thousand, two hundred twenty-one".