1200100123 has 4 divisors (see below), whose sum is σ = 1211316120. Its totient is φ = 1188884128.

The previous prime is 1200100081. The next prime is 1200100129. The reversal of 1200100123 is 3210010021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3210010021 = 463 ⋅6933067.

It is a cyclic number.

It is not a de Polignac number, because 1200100123 - 2⁹ = 1200099611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1200100129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5607838 + ... + 5608051.

It is an arithmetic number, because the mean of its divisors is an integer number (302829030).

Almost surely, 2^1200100123 is an apocalyptic number.

1200100123 is a deficient number, since it is larger than the sum of its proper divisors (11215997).

1200100123 is a wasteful number, since it uses less digits than its factorization.

1200100123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11215996.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1200100123 is about 34642.4612722595. The cubic root of 1200100123 is about 1062.6881229618.

Adding to 1200100123 its reverse (3210010021), we get a palindrome (4410110144).

The spelling of 1200100123 in words is "one billion, two hundred million, one hundred thousand, one hundred twenty-three".