2100011989 has 4 divisors (see below), whose sum is σ = 2223542124. Its totient is φ = 1976481856.

The previous prime is 2100011981. The next prime is 2100011999. The reversal of 2100011989 is 9891100012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1041030225 + 1058981764 = 32265^2 + 32542^2 .

It is a cyclic number.

It is not a de Polignac number, because 2100011989 - 2³ = 2100011981 is a prime.

It is a super-2 number, since 2×2100011989² = 8820100707887472242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2100011989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100011981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61765042 + ... + 61765075.

It is an arithmetic number, because the mean of its divisors is an integer number (555885531).

Almost surely, 2^2100011989 is an apocalyptic number.

It is an amenable number.

2100011989 is a deficient number, since it is larger than the sum of its proper divisors (123530135).

2100011989 is a wasteful number, since it uses less digits than its factorization.

2100011989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123530134.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 2100011989 is about 45825.8877600860. The cubic root of 2100011989 is about 1280.5816019453.

The spelling of 2100011989 in words is "two billion, one hundred million, eleven thousand, nine hundred eighty-nine".