121305 has 8 divisors (see below), whose sum is σ = 194112. Its totient is φ = 64688.

The previous prime is 121291. The next prime is 121309. The reversal of 121305 is 503121.

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 121305 - 2¹² = 117209 is a prime.

It is a plaindrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (121309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4029 + ... + 4058.

It is an arithmetic number, because the mean of its divisors is an integer number (24264).

2¹²¹³⁰⁵ is an apocalyptic number.

121305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121305 is a deficient number, since it is larger than the sum of its proper divisors (72807).

121305 is an equidigital number, since it uses as much as digits as its factorization.

121305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8095.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 121305 is about 348.2886733731. The cubic root of 121305 is about 49.5023975984.

Adding to 121305 its reverse (503121), we get a palindrome (624426).

The spelling of 121305 in words is "one hundred twenty-one thousand, three hundred five".