121115217 has 16 divisors (see below), whose sum is σ = 169049088. Its totient is φ = 76985040.

The previous prime is 121115213. The next prime is 121115221. The reversal of 121115217 is 712511121.

It is an interprime number because it is at equal distance from previous prime (121115213) and next prime (121115221).

It is not a de Polignac number, because 121115217 - 2² = 121115213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121115193 and 121115202.

It is not an unprimeable number, because it can be changed into a prime (121115213) 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 15 ways as a sum of consecutive naturals, for example, 20188 + ... + 25490.

It is an arithmetic number, because the mean of its divisors is an integer number (10565568).

Almost surely, 2^121115217 is an apocalyptic number.

It is an amenable number.

121115217 is a deficient number, since it is larger than the sum of its proper divisors (47933871).

121115217 is a wasteful number, since it uses less digits than its factorization.

121115217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5660.

The product of its digits is 140, while the sum is 21.

The square root of 121115217 is about 11005.2358902479. The cubic root of 121115217 is about 494.7656844278.

Adding to 121115217 its reverse (712511121), we get a palindrome (833626338).

The spelling of 121115217 in words is "one hundred twenty-one million, one hundred fifteen thousand, two hundred seventeen".