121242403 has 4 divisors (see below), whose sum is σ = 121393080. Its totient is φ = 121091728.

The previous prime is 121242391. The next prime is 121242409. The reversal of 121242403 is 304242121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304242121 = 103 ⋅2953807.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121242403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121242409) 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, 74125 + ... + 75742.

It is an arithmetic number, because the mean of its divisors is an integer number (30348270).

Almost surely, 2^121242403 is an apocalyptic number.

121242403 is a deficient number, since it is larger than the sum of its proper divisors (150677).

121242403 is an equidigital number, since it uses as much as digits as its factorization.

121242403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150676.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 121242403 is about 11011.0128053690. The cubic root of 121242403 is about 494.9388122851.

Adding to 121242403 its reverse (304242121), we get a palindrome (425484524).

The spelling of 121242403 in words is "one hundred twenty-one million, two hundred forty-two thousand, four hundred three".