121200113123 has 4 divisors (see below), whose sum is σ = 128329531560. Its totient is φ = 114070694688.

The previous prime is 121200113107. The next prime is 121200113231. The reversal of 121200113123 is 321311002121.

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

It is not a de Polignac number, because 121200113123 - 2⁴ = 121200113107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 7129418419 = 121200113123 / (1 + 2 + 1 + 2 + 0 + 0 + 1 + 1 + 3 + 1 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121200116123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3564709193 + ... + 3564709226.

It is an arithmetic number, because the mean of its divisors is an integer number (32082382890).

Almost surely, 2^121200113123 is an apocalyptic number.

121200113123 is a deficient number, since it is larger than the sum of its proper divisors (7129418437).

121200113123 is an equidigital number, since it uses as much as digits as its factorization.

121200113123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7129418436.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 121200113123 its reverse (321311002121), we get a palindrome (442511115244).

The spelling of 121200113123 in words is "one hundred twenty-one billion, two hundred million, one hundred thirteen thousand, one hundred twenty-three".