222122111212121 has 2 divisors, whose sum is σ = 222122111212122. Its totient is φ = 222122111212120.

The previous prime is 222122111212081. The next prime is 222122111212151. The reversal of 222122111212121 is 121212111221222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 199646585233225 + 22475525978896 = 14129635^2 + 4740836^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-222122111212121 is a prime.

It is not a weakly prime, because it can be changed into another prime (222122111212151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111061055606060 + 111061055606061.

It is an arithmetic number, because the mean of its divisors is an integer number (111061055606061).

Almost surely, 2^{222122111212121} is an apocalyptic number.

It is an amenable number.

222122111212121 is a deficient number, since it is larger than the sum of its proper divisors (1).

222122111212121 is an equidigital number, since it uses as much as digits as its factorization.

222122111212121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 256, while the sum is 23.

Adding to 222122111212121 its reverse (121212111221222), we get a palindrome (343334222433343).

The spelling of 222122111212121 in words is "two hundred twenty-two trillion, one hundred twenty-two billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-one".