121200018 has 64 divisors (see below), whose sum is σ = 267853824. Its totient is φ = 36432000.

The previous prime is 121200017. The next prime is 121200047. The reversal of 121200018 is 810002121.

It is not an unprimeable number, because it can be changed into a prime (121200011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175053 + ... + 175743.

It is an arithmetic number, because the mean of its divisors is an integer number (4185216).

Almost surely, 2^121200018 is an apocalyptic number.

121200018 is an abundant number, since it is smaller than the sum of its proper divisors (146653806).

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

121200018 is a wasteful number, since it uses less digits than its factorization.

121200018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791.

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 121200018 is about 11009.0879731247. The cubic root of 121200018 is about 494.8811305223.

Adding to 121200018 its reverse (810002121), we get a palindrome (931202139).

The spelling of 121200018 in words is "one hundred twenty-one million, two hundred thousand, eighteen".