121103202100123 has 4 divisors (see below), whose sum is σ = 121239733332240. Its totient is φ = 120966670868008.

The previous prime is 121103202100099. The next prime is 121103202100157. The reversal of 121103202100123 is 321001202301121.

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 121103202100123 - 2⁹ = 121103202099611 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121103202100123.

It is not an unprimeable number, because it can be changed into a prime (121103202106123) 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, 68265614728 + ... + 68265616501.

It is an arithmetic number, because the mean of its divisors is an integer number (30309933333060).

Almost surely, 2^{121103202100123} is an apocalyptic number.

121103202100123 is a deficient number, since it is larger than the sum of its proper divisors (136531232117).

121103202100123 is an equidigital number, since it uses as much as digits as its factorization.

121103202100123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136531232116.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121103202100123 its reverse (321001202301121), we get a palindrome (442104404401244).

The spelling of 121103202100123 in words is "one hundred twenty-one trillion, one hundred three billion, two hundred two million, one hundred thousand, one hundred twenty-three".