121605605 has 48 divisors (see below), whose sum is σ = 172368000. Its totient is φ = 82051200.

The previous prime is 121605593. The next prime is 121605637. The reversal of 121605605 is 506506121.

It is not a de Polignac number, because 121605605 - 2²⁰ = 120557029 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 816071 + ... + 816219.

It is an arithmetic number, because the mean of its divisors is an integer number (3591000).

Almost surely, 2^121605605 is an apocalyptic number.

It is an amenable number.

121605605 is a deficient number, since it is larger than the sum of its proper divisors (50762395).

121605605 is a wasteful number, since it uses less digits than its factorization.

121605605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 121605605 is about 11027.4931421425. The cubic root of 121605605 is about 495.4325437328.

The spelling of 121605605 in words is "one hundred twenty-one million, six hundred five thousand, six hundred five".