1211122121669 has 2 divisors, whose sum is σ = 1211122121670. Its totient is φ = 1211122121668.

The previous prime is 1211122121543. The next prime is 1211122121681. The reversal of 1211122121669 is 9661212211121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1071974471044 + 139147650625 = 1035362^2 + 373025^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211122121669 - 2⁸ = 1211122121413 is a prime.

It is a super-2 number, since 2×1211122121669² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211122127669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605561060834 + 605561060835.

It is an arithmetic number, because the mean of its divisors is an integer number (605561060835).

Almost surely, 2^{1211122121669} is an apocalyptic number.

It is an amenable number.

1211122121669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211122121669 is an equidigital number, since it uses as much as digits as its factorization.

1211122121669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 35.

The spelling of 1211122121669 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, one hundred twenty-one thousand, six hundred sixty-nine".