121608403 has 4 divisors (see below), whose sum is σ = 138981040. Its totient is φ = 104235768.

The previous prime is 121608401. The next prime is 121608427. The reversal of 121608403 is 304806121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304806121 = 809 ⋅376769.

It is not a de Polignac number, because 121608403 - 2¹ = 121608401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121608401) 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, 8686308 + ... + 8686321.

It is an arithmetic number, because the mean of its divisors is an integer number (34745260).

Almost surely, 2^121608403 is an apocalyptic number.

121608403 is a deficient number, since it is larger than the sum of its proper divisors (17372637).

121608403 is an equidigital number, since it uses as much as digits as its factorization.

121608403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17372636.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 121608403 is about 11027.6200061482. The cubic root of 121608403 is about 495.4363434744.

The spelling of 121608403 in words is "one hundred twenty-one million, six hundred eight thousand, four hundred three".