2102123999 has 4 divisors (see below), whose sum is σ = 2102249136. Its totient is φ = 2101998864.

The previous prime is 2102123993. The next prime is 2102124007. The reversal of 2102123999 is 9993212012.

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

It is a cyclic number.

It is not a de Polignac number, because 2102123999 - 2¹⁶ = 2102058463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2102123993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32579 + ... + 72564.

It is an arithmetic number, because the mean of its divisors is an integer number (525562284).

Almost surely, 2^2102123999 is an apocalyptic number.

2102123999 is a deficient number, since it is larger than the sum of its proper divisors (125137).

2102123999 is a wasteful number, since it uses less digits than its factorization.

2102123999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125136.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 2102123999 is about 45848.9258216591. The cubic root of 2102123999 is about 1281.0107574272.

The spelling of 2102123999 in words is "two billion, one hundred two million, one hundred twenty-three thousand, nine hundred ninety-nine".