121118100 has 144 divisors (see below), whose sum is σ = 368934720. Its totient is φ = 30643200.

The previous prime is 121118099. The next prime is 121118117. The reversal of 121118100 is 1811121.

It is a super-2 number, since 2×121118100² = 29339188295220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 121118100.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 528786 + ... + 529014.

Almost surely, 2^121118100 is an apocalyptic number.

121118100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121118100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184467360).

121118100 is an abundant number, since it is smaller than the sum of its proper divisors (247816620).

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

121118100 is a wasteful number, since it uses less digits than its factorization.

121118100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330 (or 323 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

The square root of 121118100 is about 11005.3668725763. The cubic root of 121118100 is about 494.7696101611.

Adding to 121118100 its reverse (1811121), we get a palindrome (122929221).

The spelling of 121118100 in words is "one hundred twenty-one million, one hundred eighteen thousand, one hundred".