121001100 has 144 divisors (see below), whose sum is σ = 392641536. Its totient is φ = 28512000.

The previous prime is 121001099. The next prime is 121001113. The reversal of 121001100 is 1100121.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

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, 121605 + ... + 122595.

Almost surely, 2^121001100 is an apocalyptic number.

121001100 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 121001100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196320768).

121001100 is an abundant number, since it is smaller than the sum of its proper divisors (271640436).

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

121001100 is a wasteful number, since it uses less digits than its factorization.

121001100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056 (or 1049 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 121001100 is about 11000.0499998864. The cubic root of 121001100 is about 494.6102431347.

Adding to 121001100 its reverse (1100121), we get a palindrome (122101221).

The spelling of 121001100 in words is "one hundred twenty-one million, one thousand, one hundred".