2121211111969 has 2 divisors, whose sum is σ = 2121211111970. Its totient is φ = 2121211111968.

The previous prime is 2121211111889. The next prime is 2121211111979. The reversal of 2121211111969 is 9691111121212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1241764779025 + 879446332944 = 1114345^2 + 937788^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121211111969 - 2⁷ = 2121211111841 is a prime.

It is a super-2 number, since 2×2121211111969² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2121211111979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060605555984 + 1060605555985.

It is an arithmetic number, because the mean of its divisors is an integer number (1060605555985).

Almost surely, 2^{2121211111969} is an apocalyptic number.

It is an amenable number.

2121211111969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121211111969 is an equidigital number, since it uses as much as digits as its factorization.

2121211111969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 37.

The spelling of 2121211111969 in words is "two trillion, one hundred twenty-one billion, two hundred eleven million, one hundred eleven thousand, nine hundred sixty-nine".