2121111119969 has 2 divisors, whose sum is σ = 2121111119970. Its totient is φ = 2121111119968.

The previous prime is 2121111119923. The next prime is 2121111119989. The reversal of 2121111119969 is 9699111111212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1755797254225 + 365313865744 = 1325065^2 + 604412^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121111119969 - 2¹² = 2121111115873 is a prime.

It is a super-2 number, since 2×2121111119969² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2121111119989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060555559984 + 1060555559985.

It is an arithmetic number, because the mean of its divisors is an integer number (1060555559985).

Almost surely, 2^{2121111119969} is an apocalyptic number.

It is an amenable number.

2121111119969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121111119969 is an equidigital number, since it uses as much as digits as its factorization.

2121111119969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 44.

The spelling of 2121111119969 in words is "two trillion, one hundred twenty-one billion, one hundred eleven million, one hundred nineteen thousand, nine hundred sixty-nine".