121320018 has 20 divisors (see below), whose sum is σ = 271847070. Its totient is φ = 40439952.

The previous prime is 121320011. The next prime is 121320029. The reversal of 121320018 is 810023121.

It can be written as a sum of positive squares in only one way, i.e., 115283169 + 6036849 = 10737^2 + 2457^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (121320011) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 374283 + ... + 374606.

Almost surely, 2^121320018 is an apocalyptic number.

121320018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121320018 is an abundant number, since it is smaller than the sum of its proper divisors (150527052).

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

121320018 is an equidigital number, since it uses as much as digits as its factorization.

121320018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748903 (or 748894 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 121320018 is about 11014.5366675135. The cubic root of 121320018 is about 495.0444037302.

Adding to 121320018 its reverse (810023121), we get a palindrome (931343139).

The spelling of 121320018 in words is "one hundred twenty-one million, three hundred twenty thousand, eighteen".