121228123 has 4 divisors (see below), whose sum is σ = 121358440. Its totient is φ = 121097808.

The previous prime is 121228099. The next prime is 121228141. The reversal of 121228123 is 321822121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121228123 is a prime.

It is a super-2 number, since 2×121228123² = 29392515612206258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121228094 and 121228103.

It is not an unprimeable number, because it can be changed into a prime (121228823) 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, 63753 + ... + 65626.

It is an arithmetic number, because the mean of its divisors is an integer number (30339610).

Almost surely, 2^121228123 is an apocalyptic number.

121228123 is a deficient number, since it is larger than the sum of its proper divisors (130317).

121228123 is an equidigital number, since it uses as much as digits as its factorization.

121228123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130316.

The product of its digits is 384, while the sum is 22.

The square root of 121228123 is about 11010.3643445619. The cubic root of 121228123 is about 494.9193801295.

The spelling of 121228123 in words is "one hundred twenty-one million, two hundred twenty-eight thousand, one hundred twenty-three".