121815107 has 4 divisors (see below), whose sum is σ = 127111440. Its totient is φ = 116518776.

The previous prime is 121815097. The next prime is 121815119. The reversal of 121815107 is 701518121.

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 121815107 - 2⁸ = 121814851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121815157) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2648132 + ... + 2648177.

It is an arithmetic number, because the mean of its divisors is an integer number (31777860).

Almost surely, 2^121815107 is an apocalyptic number.

121815107 is a deficient number, since it is larger than the sum of its proper divisors (5296333).

121815107 is an equidigital number, since it uses as much as digits as its factorization.

121815107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5296332.

The product of its (nonzero) digits is 560, while the sum is 26.

The square root of 121815107 is about 11036.9881308263. The cubic root of 121815107 is about 495.7168907147.

The spelling of 121815107 in words is "one hundred twenty-one million, eight hundred fifteen thousand, one hundred seven".