121215 has 8 divisors (see below), whose sum is σ = 193968. Its totient is φ = 64640.

The previous prime is 121189. The next prime is 121229. The reversal of 121215 is 512121.

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

It is not a de Polignac number, because 121215 - 2⁶ = 121151 is a prime.

121215 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 121215.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4026 + ... + 4055.

It is an arithmetic number, because the mean of its divisors is an integer number (24246).

2¹²¹²¹⁵ is an apocalyptic number.

121215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121215 is a deficient number, since it is larger than the sum of its proper divisors (72753).

121215 is an equidigital number, since it uses as much as digits as its factorization.

121215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8089.

The product of its digits is 20, while the sum is 12.

The square root of 121215 is about 348.1594462312. The cubic root of 121215 is about 49.4901521068.

Adding to 121215 its reverse (512121), we get a palindrome (633336).

The spelling of 121215 in words is "one hundred twenty-one thousand, two hundred fifteen".