210210121121999 has 2 divisors, whose sum is σ = 210210121122000. Its totient is φ = 210210121121998.

The previous prime is 210210121121993. The next prime is 210210121122073. The reversal of 210210121121999 is 999121121012012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210210121121999 - 2²⁸ = 210209852686543 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210210121121993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105105060560999 + 105105060561000.

It is an arithmetic number, because the mean of its divisors is an integer number (105105060561000).

Almost surely, 2^{210210121121999} is an apocalyptic number.

210210121121999 is a deficient number, since it is larger than the sum of its proper divisors (1).

210210121121999 is an equidigital number, since it uses as much as digits as its factorization.

210210121121999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 41.

The spelling of 210210121121999 in words is "two hundred ten trillion, two hundred ten billion, one hundred twenty-one million, one hundred twenty-one thousand, nine hundred ninety-nine".