12161100 has 72 divisors (see below), whose sum is σ = 40219648. Its totient is φ = 2779200.

The previous prime is 12161099. The next prime is 12161113. The reversal of 12161100 is 116121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 796 + ... + 4995.

Almost surely, 2^12161100 is an apocalyptic number.

12161100 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 12161100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20109824).

12161100 is an abundant number, since it is smaller than the sum of its proper divisors (28058548).

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

12161100 is a wasteful number, since it uses less digits than its factorization.

12161100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5815 (or 5808 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 12.

The square root of 12161100 is about 3487.2768745828. The cubic root of 12161100 is about 229.9628169255.

Adding to 12161100 its reverse (116121), we get a palindrome (12277221).

The spelling of 12161100 in words is "twelve million, one hundred sixty-one thousand, one hundred".