210111109997 has 2 divisors, whose sum is σ = 210111109998. Its totient is φ = 210111109996.

The previous prime is 210111109991. The next prime is 210111110009. The reversal of 210111109997 is 799901111012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205395678436 + 4715431561 = 453206^2 + 68669^2 .

It is a cyclic number.

It is not a de Polignac number, because 210111109997 - 2¹⁴ = 210111093613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210111109991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105055554998 + 105055554999.

It is an arithmetic number, because the mean of its divisors is an integer number (105055554999).

Almost surely, 2^210111109997 is an apocalyptic number.

It is an amenable number.

210111109997 is a deficient number, since it is larger than the sum of its proper divisors (1).

210111109997 is an equidigital number, since it uses as much as digits as its factorization.

210111109997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 41.

The spelling of 210111109997 in words is "two hundred ten billion, one hundred eleven million, one hundred nine thousand, nine hundred ninety-seven".