121018 has 4 divisors (see below), whose sum is σ = 181530. Its totient is φ = 60508.

The previous prime is 121013. The next prime is 121019. The reversal of 121018 is 810121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 71289 + 49729 = 267^2 + 223^2 .

It is an alternating number because its digits alternate between odd and even.

It is a plaindrome in base 15.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 120989 and 121007.

It is not an unprimeable number, because it can be changed into a prime (121013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30253 + ... + 30256.

2¹²¹⁰¹⁸ is an apocalyptic number.

121018 is a deficient number, since it is larger than the sum of its proper divisors (60512).

121018 is an equidigital number, since it uses as much as digits as its factorization.

121018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60511.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 121018 is about 347.8764148372. The cubic root of 121018 is about 49.4633269162.

Adding to 121018 its reverse (810121), we get a palindrome (931139).

The spelling of 121018 in words is "one hundred twenty-one thousand, eighteen".