121507505 has 24 divisors (see below), whose sum is σ = 176997312. Its totient is φ = 79693152.

The previous prime is 121507493. The next prime is 121507511. The reversal of 121507505 is 505705121.

It is a happy number.

It is not a de Polignac number, because 121507505 - 2⁸ = 121507249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5147 + ... + 16416.

It is an arithmetic number, because the mean of its divisors is an integer number (7374888).

Almost surely, 2^121507505 is an apocalyptic number.

It is an amenable number.

121507505 is a deficient number, since it is larger than the sum of its proper divisors (55489807).

121507505 is a wasteful number, since it uses less digits than its factorization.

121507505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21605 (or 21598 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 121507505 is about 11023.0442709807. The cubic root of 121507505 is about 495.2992850518.

The spelling of 121507505 in words is "one hundred twenty-one million, five hundred seven thousand, five hundred five".