121818903 has 8 divisors (see below), whose sum is σ = 162575088. Its totient is φ = 81137664.

The previous prime is 121818887. The next prime is 121818919. The reversal of 121818903 is 309818121.

It is an interprime number because it is at equal distance from previous prime (121818887) and next prime (121818919).

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

It is not a de Polignac number, because 121818903 - 2⁴ = 121818887 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121818953) 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, 14826 + ... + 21527.

It is an arithmetic number, because the mean of its divisors is an integer number (20321886).

Almost surely, 2^121818903 is an apocalyptic number.

121818903 is a deficient number, since it is larger than the sum of its proper divisors (40756185).

121818903 is a wasteful number, since it uses less digits than its factorization.

121818903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37473.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 121818903 is about 11037.1600966915. The cubic root of 121818903 is about 495.7220398346.

The spelling of 121818903 in words is "one hundred twenty-one million, eight hundred eighteen thousand, nine hundred three".