121515424115 has 4 divisors (see below), whose sum is σ = 145818508944. Its totient is φ = 97212339288.

The previous prime is 121515424099. The next prime is 121515424117. The reversal of 121515424115 is 511424515121.

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 121515424115 - 2⁴ = 121515424099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121515424117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12151542407 + ... + 12151542416.

It is an arithmetic number, because the mean of its divisors is an integer number (36454627236).

Almost surely, 2^121515424115 is an apocalyptic number.

121515424115 is a deficient number, since it is larger than the sum of its proper divisors (24303084829).

121515424115 is an equidigital number, since it uses as much as digits as its factorization.

121515424115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24303084828.

The product of its digits is 8000, while the sum is 32.

Adding to 121515424115 its reverse (511424515121), we get a palindrome (632939939236).

The spelling of 121515424115 in words is "one hundred twenty-one billion, five hundred fifteen million, four hundred twenty-four thousand, one hundred fifteen".