121603403 has 4 divisors (see below), whose sum is σ = 121652928. Its totient is φ = 121553880.

The previous prime is 121603387. The next prime is 121603411. The reversal of 121603403 is 304306121.

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 121603403 - 2⁴ = 121603387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121603463) 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, 20876 + ... + 26057.

It is an arithmetic number, because the mean of its divisors is an integer number (30413232).

Almost surely, 2^121603403 is an apocalyptic number.

121603403 is a deficient number, since it is larger than the sum of its proper divisors (49525).

121603403 is an equidigital number, since it uses as much as digits as its factorization.

121603403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49524.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 121603403 is about 11027.3933003226. The cubic root of 121603403 is about 495.4295533305.

Adding to 121603403 its reverse (304306121), we get a palindrome (425909524).

The spelling of 121603403 in words is "one hundred twenty-one million, six hundred three thousand, four hundred three".