121200100123 has 4 divisors (see below), whose sum is σ = 124156200168. Its totient is φ = 118244000080.

The previous prime is 121200100093. The next prime is 121200100127. The reversal of 121200100123 is 321001002121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321001002121 = 7753 ⋅41403457.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121200100123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121200100127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1478049961 + ... + 1478050042.

It is an arithmetic number, because the mean of its divisors is an integer number (31039050042).

Almost surely, 2^121200100123 is an apocalyptic number.

121200100123 is a deficient number, since it is larger than the sum of its proper divisors (2956100045).

121200100123 is an equidigital number, since it uses as much as digits as its factorization.

121200100123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2956100044.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 121200100123 its reverse (321001002121), we get a palindrome (442201102244).

The spelling of 121200100123 in words is "one hundred twenty-one billion, two hundred million, one hundred thousand, one hundred twenty-three".