2101200123 has 16 divisors (see below), whose sum is σ = 3059625600. Its totient is φ = 1272065280.

The previous prime is 2101200097. The next prime is 2101200137. The reversal of 2101200123 is 3210021012.

It is a de Polignac number, because none of the positive numbers 2^k-2101200123 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2101200099 and 2101200108.

It is not an unprimeable number, because it can be changed into a prime (2101200163) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3613 + ... + 64926.

It is an arithmetic number, because the mean of its divisors is an integer number (191226600).

Almost surely, 2^2101200123 is an apocalyptic number.

2101200123 is a deficient number, since it is larger than the sum of its proper divisors (958425477).

2101200123 is a wasteful number, since it uses less digits than its factorization.

2101200123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69482.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 2101200123 is about 45838.8494947245. The cubic root of 2101200123 is about 1280.8230633745.

Adding to 2101200123 its reverse (3210021012), we get a palindrome (5311221135).

The spelling of 2101200123 in words is "two billion, one hundred one million, two hundred thousand, one hundred twenty-three".