121224515 has 16 divisors (see below), whose sum is σ = 151383168. Its totient is φ = 93115776.

The previous prime is 121224491. The next prime is 121224517. The reversal of 121224515 is 515422121.

It is a cyclic number.

It is not a de Polignac number, because 121224515 - 2⁶ = 121224451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121224517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7589 + ... + 17321.

It is an arithmetic number, because the mean of its divisors is an integer number (9461448).

Almost surely, 2^121224515 is an apocalyptic number.

121224515 is a deficient number, since it is larger than the sum of its proper divisors (30158653).

121224515 is an equidigital number, since it uses as much as digits as its factorization.

121224515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9838.

The product of its digits is 800, while the sum is 23.

The square root of 121224515 is about 11010.2004977203. The cubic root of 121224515 is about 494.9144701389.

Adding to 121224515 its reverse (515422121), we get a palindrome (636646636).

The spelling of 121224515 in words is "one hundred twenty-one million, two hundred twenty-four thousand, five hundred fifteen".