222211021222121 has 2 divisors, whose sum is σ = 222211021222122. Its totient is φ = 222211021222120.

The previous prime is 222211021222079. The next prime is 222211021222123. The reversal of 222211021222121 is 121222120112222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115836550782121 + 106374470440000 = 10762739^2 + 10313800^2 .

It is a cyclic number.

It is not a de Polignac number, because 222211021222121 - 2¹⁰ = 222211021221097 is a prime.

Together with 222211021222123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (222211021222123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111105510611060 + 111105510611061.

It is an arithmetic number, because the mean of its divisors is an integer number (111105510611061).

Almost surely, 2^{222211021222121} is an apocalyptic number.

It is an amenable number.

222211021222121 is a deficient number, since it is larger than the sum of its proper divisors (1).

222211021222121 is an equidigital number, since it uses as much as digits as its factorization.

222211021222121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 222211021222121 its reverse (121222120112222), we get a palindrome (343433141334343).

The spelling of 222211021222121 in words is "two hundred twenty-two trillion, two hundred eleven billion, twenty-one million, two hundred twenty-two thousand, one hundred twenty-one".