121687218 has 32 divisors (see below), whose sum is σ = 271062720. Its totient is φ = 40465440.

The previous prime is 121687211. The next prime is 121687231. The reversal of 121687218 is 812786121.

It is not an unprimeable number, because it can be changed into a prime (121687211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22213 + ... + 27143.

It is an arithmetic number, because the mean of its divisors is an integer number (8470710).

Almost surely, 2^121687218 is an apocalyptic number.

121687218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121687218 is an abundant number, since it is smaller than the sum of its proper divisors (149375502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121687218 is a wasteful number, since it uses less digits than its factorization.

121687218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5399 (or 5393 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 121687218 is about 11031.1929545267. The cubic root of 121687218 is about 495.5433519315.

The spelling of 121687218 in words is "one hundred twenty-one million, six hundred eighty-seven thousand, two hundred eighteen".