121015 has 4 divisors (see below), whose sum is σ = 145224. Its totient is φ = 96808.

The previous prime is 121013. The next prime is 121019. The reversal of 121015 is 510121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121015 - 2¹ = 121013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120992 and 121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121013) 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 3 ways as a sum of consecutive naturals, for example, 12097 + ... + 12106.

It is an arithmetic number, because the mean of its divisors is an integer number (36306).

2¹²¹⁰¹⁵ is an apocalyptic number.

121015 is a deficient number, since it is larger than the sum of its proper divisors (24209).

121015 is an equidigital number, since it uses as much as digits as its factorization.

121015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24208.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 121015 is about 347.8721029344. The cubic root of 121015 is about 49.4629181858.

Adding to 121015 its reverse (510121), we get a palindrome (631136).

It can be divided in two parts, 1210 and 15, that added together give a triangular number (1225 = T₄₉).

The spelling of 121015 in words is "one hundred twenty-one thousand, fifteen".