121391103 has 8 divisors (see below), whose sum is σ = 162373168. Its totient is φ = 80668224.

The previous prime is 121391099. The next prime is 121391111. The reversal of 121391103 is 301193121.

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

It is not a de Polignac number, because 121391103 - 2² = 121391099 is a prime.

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 121391103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121391113) 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 7 ways as a sum of consecutive naturals, for example, 63700 + ... + 65577.

It is an arithmetic number, because the mean of its divisors is an integer number (20296646).

Almost surely, 2^121391103 is an apocalyptic number.

121391103 is a deficient number, since it is larger than the sum of its proper divisors (40982065).

121391103 is a wasteful number, since it uses less digits than its factorization.

121391103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129593.

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 121391103 is about 11017.7630669751. The cubic root of 121391103 is about 495.1410719230.

The spelling of 121391103 in words is "one hundred twenty-one million, three hundred ninety-one thousand, one hundred three".