121803915 has 16 divisors (see below), whose sum is σ = 201607200. Its totient is φ = 62721792.

The previous prime is 121803901. The next prime is 121803917. The reversal of 121803915 is 519308121.

It is not a de Polignac number, because 121803915 - 2⁸ = 121803659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121803917) 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, 139570 + ... + 140439.

It is an arithmetic number, because the mean of its divisors is an integer number (12600450).

Almost surely, 2^121803915 is an apocalyptic number.

121803915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121803915 is a deficient number, since it is larger than the sum of its proper divisors (79803285).

121803915 is a wasteful number, since it uses less digits than its factorization.

121803915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280046.

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 121803915 is about 11036.4810967989. The cubic root of 121803915 is about 495.7017085984.

The spelling of 121803915 in words is "one hundred twenty-one million, eight hundred three thousand, nine hundred fifteen".