2121100099 has 2 divisors, whose sum is σ = 2121100100. Its totient is φ = 2121100098.

The previous prime is 2121100097. The next prime is 2121100103. The reversal of 2121100099 is 9900011212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121100099 - 2¹ = 2121100097 is a prime.

Together with 2121100097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2121100097) 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, 1060550049 + 1060550050.

It is an arithmetic number, because the mean of its divisors is an integer number (1060550050).

Almost surely, 2^2121100099 is an apocalyptic number.

2121100099 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121100099 is an equidigital number, since it uses as much as digits as its factorization.

2121100099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 2121100099 is about 46055.4024952556. The cubic root of 2121100099 is about 1284.8538240058.

The spelling of 2121100099 in words is "two billion, one hundred twenty-one million, one hundred thousand, ninety-nine".