121215115 has 32 divisors (see below), whose sum is σ = 175325184. Its totient is φ = 78693120.

The previous prime is 121215103. The next prime is 121215119. The reversal of 121215115 is 511512121.

It is not a de Polignac number, because 121215115 - 2²³ = 112826507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121215092 and 121215101.

It is not an unprimeable number, because it can be changed into a prime (121215119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49807 + ... + 52183.

It is an arithmetic number, because the mean of its divisors is an integer number (5478912).

Almost surely, 2^121215115 is an apocalyptic number.

121215115 is a deficient number, since it is larger than the sum of its proper divisors (54110069).

121215115 is a wasteful number, since it uses less digits than its factorization.

121215115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2467.

The product of its digits is 100, while the sum is 19.

The square root of 121215115 is about 11009.7736125681. The cubic root of 121215115 is about 494.9016775771.

Adding to 121215115 its reverse (511512121), we get a palindrome (632727236).

The spelling of 121215115 in words is "one hundred twenty-one million, two hundred fifteen thousand, one hundred fifteen".