121805103 has 8 divisors (see below), whose sum is σ = 185607808. Its totient is φ = 69602904.

The previous prime is 121805063. The next prime is 121805113. The reversal of 121805103 is 301508121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121805103 - 2⁹ = 121804591 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 5800243 = 121805103 / (1 + 2 + 1 + 8 + 0 + 5 + 1 + 0 + 3).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121805103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121805113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2900101 + ... + 2900142.

It is an arithmetic number, because the mean of its divisors is an integer number (23200976).

Almost surely, 2^121805103 is an apocalyptic number.

121805103 is a deficient number, since it is larger than the sum of its proper divisors (63802705).

121805103 is an equidigital number, since it uses as much as digits as its factorization.

121805103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5800253.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 121805103 is about 11036.5349181706. The cubic root of 121805103 is about 495.7033201824.

The spelling of 121805103 in words is "one hundred twenty-one million, eight hundred five thousand, one hundred three".