2222212212161 has 2 divisors, whose sum is σ = 2222212212162. Its totient is φ = 2222212212160.

The previous prime is 2222212212091. The next prime is 2222212212247. The reversal of 2222212212161 is 1612122122222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1630297402561 + 591914809600 = 1276831^2 + 769360^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2222212212161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2222212212161.

It is not a weakly prime, because it can be changed into another prime (2222212262161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1111106106080 + 1111106106081.

It is an arithmetic number, because the mean of its divisors is an integer number (1111106106081).

Almost surely, 2^{2222212212161} is an apocalyptic number.

It is an amenable number.

2222212212161 is a deficient number, since it is larger than the sum of its proper divisors (1).

2222212212161 is an equidigital number, since it uses as much as digits as its factorization.

2222212212161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 26.

Adding to 2222212212161 its reverse (1612122122222), we get a palindrome (3834334334383).

The spelling of 2222212212161 in words is "two trillion, two hundred twenty-two billion, two hundred twelve million, two hundred twelve thousand, one hundred sixty-one".