210121202099999 has 2 divisors, whose sum is σ = 210121202100000. Its totient is φ = 210121202099998.

The previous prime is 210121202099993. The next prime is 210121202100001. The reversal of 210121202099999 is 999990202121012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 210121202099999 - 2²⁰ = 210121201051423 is a prime.

Together with 210121202100001, 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 (210121202099993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105060601049999 + 105060601050000.

It is an arithmetic number, because the mean of its divisors is an integer number (105060601050000).

Almost surely, 2^{210121202099999} is an apocalyptic number.

210121202099999 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121202099999 is an equidigital number, since it uses as much as digits as its factorization.

210121202099999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 944784, while the sum is 56.

The spelling of 210121202099999 in words is "two hundred ten trillion, one hundred twenty-one billion, two hundred two million, ninety-nine thousand, nine hundred ninety-nine".