121867218 has 24 divisors (see below), whose sum is σ = 288050256. Its totient is φ = 36929400.

The previous prime is 121867199. The next prime is 121867247. The reversal of 121867218 is 812768121.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 307548 + ... + 307943.

It is an arithmetic number, because the mean of its divisors is an integer number (12002094).

Almost surely, 2^121867218 is an apocalyptic number.

121867218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121867218 is an abundant number, since it is smaller than the sum of its proper divisors (166183038).

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

121867218 is a wasteful number, since it uses less digits than its factorization.

121867218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615510 (or 615507 counting only the distinct ones).

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

The square root of 121867218 is about 11039.3486220882. The cubic root of 121867218 is about 495.7875678275.

The spelling of 121867218 in words is "one hundred twenty-one million, eight hundred sixty-seven thousand, two hundred eighteen".