121605603 has 24 divisors (see below), whose sum is σ = 191443392. Its totient is φ = 68446224.

The previous prime is 121605593. The next prime is 121605637. The reversal of 121605603 is 306506121.

It is not a de Polignac number, because 121605603 - 2⁵ = 121605571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121605103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3676 + ... + 16022.

It is an arithmetic number, because the mean of its divisors is an integer number (7976808).

Almost surely, 2^121605603 is an apocalyptic number.

121605603 is a deficient number, since it is larger than the sum of its proper divisors (69837789).

121605603 is a wasteful number, since it uses less digits than its factorization.

121605603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12431 (or 12424 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 121605603 is about 11027.4930514601. The cubic root of 121605603 is about 495.4325410167.

The spelling of 121605603 in words is "one hundred twenty-one million, six hundred five thousand, six hundred three".