12281100 has 144 divisors (see below), whose sum is σ = 39664128. Its totient is φ = 2914560.

The previous prime is 12281063. The next prime is 12281111. The reversal of 12281100 is 118221.

12281100 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 12281100.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 183267 + ... + 183333.

Almost surely, 2^12281100 is an apocalyptic number.

12281100 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 12281100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19832064).

12281100 is an abundant number, since it is smaller than the sum of its proper divisors (27383028).

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

12281100 is a wasteful number, since it uses less digits than its factorization.

12281100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 137 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

The square root of 12281100 is about 3504.4400408624. The cubic root of 12281100 is about 230.7167307922.

Adding to 12281100 its reverse (118221), we get a palindrome (12399321).

The spelling of 12281100 in words is "twelve million, two hundred eighty-one thousand, one hundred".