121100 has 36 divisors (see below), whose sum is σ = 302064. Its totient is φ = 41280.

The previous prime is 121081. The next prime is 121123. The reversal of 121100 is 1121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (5).

It is an unprimeable number.

121100 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 614 + ... + 786.

2¹²¹¹⁰⁰ is an apocalyptic number.

121100 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 121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151032).

121100 is an abundant number, since it is smaller than the sum of its proper divisors (180964).

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

121100 is a wasteful number, since it uses less digits than its factorization.

121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194 (or 187 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 121100 is about 347.9942528261. The cubic root of 121100 is about 49.4744962658.

Adding to 121100 its reverse (1121), we get a palindrome (122221).

The spelling of 121100 in words is "one hundred twenty-one thousand, one hundred", and thus it is an iban number.