121918216903 has 16 divisors (see below), whose sum is σ = 140303162880. Its totient is φ = 103776867936.

The previous prime is 121918216877. The next prime is 121918216909. The reversal of 121918216903 is 309612819121.

It is not a de Polignac number, because 121918216903 - 2³³ = 113328282311 is a prime.

It is a super-2 number, since 2×121918216903² (a number of 23 digits) contains 22 as substring.

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 121918216903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121918216909) 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 15 ways as a sum of consecutive naturals, for example, 865501 + ... + 996457.

It is an arithmetic number, because the mean of its divisors is an integer number (8768947680).

Almost surely, 2^121918216903 is an apocalyptic number.

121918216903 is a deficient number, since it is larger than the sum of its proper divisors (18384945977).

121918216903 is a wasteful number, since it uses less digits than its factorization.

121918216903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131886.

The product of its (nonzero) digits is 46656, while the sum is 43.

The spelling of 121918216903 in words is "one hundred twenty-one billion, nine hundred eighteen million, two hundred sixteen thousand, nine hundred three".