121442403 has 4 divisors (see below), whose sum is σ = 161923208. Its totient is φ = 80961600.

The previous prime is 121442389. The next prime is 121442437. The reversal of 121442403 is 304244121.

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

It is not a de Polignac number, because 121442403 - 2¹⁰ = 121441379 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 121442403.

It is not an unprimeable number, because it can be changed into a prime (121442443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20240398 + ... + 20240403.

It is an arithmetic number, because the mean of its divisors is an integer number (40480802).

Almost surely, 2^121442403 is an apocalyptic number.

121442403 is a deficient number, since it is larger than the sum of its proper divisors (40480805).

121442403 is an equidigital number, since it uses as much as digits as its factorization.

121442403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40480804.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 121442403 is about 11020.0908798431. The cubic root of 121442403 is about 495.2108111353.

Adding to 121442403 its reverse (304244121), we get a palindrome (425686524).

The spelling of 121442403 in words is "one hundred twenty-one million, four hundred forty-two thousand, four hundred three".