121042403 has 4 divisors (see below), whose sum is σ = 122402520. Its totient is φ = 119682288.

The previous prime is 121042387. The next prime is 121042417. The reversal of 121042403 is 304240121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304240121 = 2659 ⋅114419.

It is a cyclic number.

It is not a de Polignac number, because 121042403 - 2⁴ = 121042387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121042903) 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, 679925 + ... + 680102.

It is an arithmetic number, because the mean of its divisors is an integer number (30600630).

Almost surely, 2^121042403 is an apocalyptic number.

121042403 is a deficient number, since it is larger than the sum of its proper divisors (1360117).

121042403 is an equidigital number, since it uses as much as digits as its factorization.

121042403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360116.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 121042403 is about 11001.9272402611. The cubic root of 121042403 is about 494.6665141463. Note that the first 3 decimals are identical.

Adding to 121042403 its reverse (304240121), we get a palindrome (425282524).

The spelling of 121042403 in words is "one hundred twenty-one million, forty-two thousand, four hundred three".