210211111009 has 2 divisors, whose sum is σ = 210211111010. Its totient is φ = 210211111008.

The previous prime is 210211111001. The next prime is 210211111021. The reversal of 210211111009 is 900111112012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 180272422225 + 29938688784 = 424585^2 + 173028^2 .

It is a cyclic number.

It is not a de Polignac number, because 210211111009 - 2³ = 210211111001 is a prime.

It is a super-2 number, since 2×210211111009² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (210211111001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105105555504 + 105105555505.

It is an arithmetic number, because the mean of its divisors is an integer number (105105555505).

Almost surely, 2^210211111009 is an apocalyptic number.

It is an amenable number.

210211111009 is a deficient number, since it is larger than the sum of its proper divisors (1).

210211111009 is an equidigital number, since it uses as much as digits as its factorization.

210211111009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 210211111009 in words is "two hundred ten billion, two hundred eleven million, one hundred eleven thousand, nine".