121505 has 8 divisors (see below), whose sum is σ = 153600. Its totient is φ = 92016.

The previous prime is 121501. The next prime is 121507. The reversal of 121505 is 505121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121505 - 2² = 121501 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121505.

It is not an unprimeable number, because it can be changed into a prime (121501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545 + ... + 734.

It is an arithmetic number, because the mean of its divisors is an integer number (19200).

2¹²¹⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

121505 is a deficient number, since it is larger than the sum of its proper divisors (32095).

121505 is a wasteful number, since it uses less digits than its factorization.

121505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303.

The product of its (nonzero) digits is 50, while the sum is 14.

The square root of 121505 is about 348.5756732763. The cubic root of 121505 is about 49.5295881330.

Adding to 121505 its reverse (505121), we get a palindrome (626626).

It can be divided in two parts, 121 and 505, that added together give a palindrome (626).

The spelling of 121505 in words is "one hundred twenty-one thousand, five hundred five".