210211111019909 has 2 divisors, whose sum is σ = 210211111019910. Its totient is φ = 210211111019908.

The previous prime is 210211111019891. The next prime is 210211111019951. The reversal of 210211111019909 is 909910111112012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208778744875684 + 1432366144225 = 14449178^2 + 1196815^2 .

It is a cyclic number.

It is not a de Polignac number, because 210211111019909 - 2¹² = 210211111015813 is a prime.

It is a super-2 number, since 2×210211111019909² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210211111019969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105105555509954 + 105105555509955.

It is an arithmetic number, because the mean of its divisors is an integer number (105105555509955).

Almost surely, 2^{210211111019909} is an apocalyptic number.

It is an amenable number.

210211111019909 is a deficient number, since it is larger than the sum of its proper divisors (1).

210211111019909 is an equidigital number, since it uses as much as digits as its factorization.

210211111019909 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 38.

The spelling of 210211111019909 in words is "two hundred ten trillion, two hundred eleven billion, one hundred eleven million, nineteen thousand, nine hundred nine".