121317819 has 16 divisors (see below), whose sum is σ = 185352960. Its totient is φ = 69141600.

The previous prime is 121317809. The next prime is 121317821. The reversal of 121317819 is 918713121.

It is not a de Polignac number, because 121317819 - 2⁹ = 121317307 is a prime.

It is a super-2 number, since 2×121317819² = 29436026413833522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121317819.

It is not an unprimeable number, because it can be changed into a prime (121317809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 744 + ... + 15594.

It is an arithmetic number, because the mean of its divisors is an integer number (11584560).

Almost surely, 2^121317819 is an apocalyptic number.

121317819 is a deficient number, since it is larger than the sum of its proper divisors (64035141).

121317819 is a wasteful number, since it uses less digits than its factorization.

121317819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15250.

The product of its digits is 3024, while the sum is 33.

The square root of 121317819 is about 11014.4368444329. The cubic root of 121317819 is about 495.0414127173.

The spelling of 121317819 in words is "one hundred twenty-one million, three hundred seventeen thousand, eight hundred nineteen".