121317818 has 16 divisors (see below), whose sum is σ = 188987904. Its totient is φ = 58345680.

The previous prime is 121317809. The next prime is 121317821. The reversal of 121317818 is 818713121.

It is a super-2 number, since 2×121317818² = 29436025928562248, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4496 + ... + 16212.

It is an arithmetic number, because the mean of its divisors is an integer number (11811744).

Almost surely, 2^121317818 is an apocalyptic number.

121317818 is a deficient number, since it is larger than the sum of its proper divisors (67670086).

121317818 is a wasteful number, since it uses less digits than its factorization.

121317818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11917.

The product of its digits is 2688, while the sum is 32.

The square root of 121317818 is about 11014.4367990379. The cubic root of 121317818 is about 495.0414113571.

The spelling of 121317818 in words is "one hundred twenty-one million, three hundred seventeen thousand, eight hundred eighteen".