121115 has 4 divisors (see below), whose sum is σ = 145344. Its totient is φ = 96888.

The previous prime is 121081. The next prime is 121123. The reversal of 121115 is 511121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511121 = 13 ⋅39317.

It is a cyclic number.

It is not a de Polignac number, because 121115 - 2¹⁰ = 120091 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121096 and 121105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12107 + ... + 12116.

It is an arithmetic number, because the mean of its divisors is an integer number (36336).

2¹²¹¹¹⁵ is an apocalyptic number.

121115 is a deficient number, since it is larger than the sum of its proper divisors (24229).

121115 is an equidigital number, since it uses as much as digits as its factorization.

121115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24228.

The product of its digits is 10, while the sum is 11.

The square root of 121115 is about 348.0158042388. The cubic root of 121115 is about 49.4765388940.

Subtracting from 121115 its sum of digits (11), we obtain a square (121104 = 348²).

Adding to 121115 its reverse (511121), we get a palindrome (632236).

The spelling of 121115 in words is "one hundred twenty-one thousand, one hundred fifteen".