2121101999 has 2 divisors, whose sum is σ = 2121102000. Its totient is φ = 2121101998.

The previous prime is 2121101911. The next prime is 2121102001. The reversal of 2121101999 is 9991011212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121101999 is a prime.

Together with 2121102001, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121101299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060550999 + 1060551000.

It is an arithmetic number, because the mean of its divisors is an integer number (1060551000).

Almost surely, 2^2121101999 is an apocalyptic number.

2121101999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121101999 is an equidigital number, since it uses as much as digits as its factorization.

2121101999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 35.

The square root of 2121101999 is about 46055.4231225813. The cubic root of 2121101999 is about 1284.8542076465.

The spelling of 2121101999 in words is "two billion, one hundred twenty-one million, one hundred one thousand, nine hundred ninety-nine".