210012111989 has 2 divisors, whose sum is σ = 210012111990. Its totient is φ = 210012111988.

The previous prime is 210012111977. The next prime is 210012112021. The reversal of 210012111989 is 989111210012.

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., 185493876100 + 24518235889 = 430690^2 + 156583^2 .

It is a cyclic number.

It is not a de Polignac number, because 210012111989 - 2²⁰ = 210011063413 is a prime.

It is a super-3 number, since 3×210012111989³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210012111949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105006055994 + 105006055995.

It is an arithmetic number, because the mean of its divisors is an integer number (105006055995).

Almost surely, 2^210012111989 is an apocalyptic number.

It is an amenable number.

210012111989 is a deficient number, since it is larger than the sum of its proper divisors (1).

210012111989 is an equidigital number, since it uses as much as digits as its factorization.

210012111989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 210012111989 in words is "two hundred ten billion, twelve million, one hundred eleven thousand, nine hundred eighty-nine".