12321100 has 72 divisors (see below), whose sum is σ = 30498048. Its totient is φ = 4276800.

The previous prime is 12321083. The next prime is 12321121. The reversal of 12321100 is 112321.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 25057 + ... + 25543.

It is an arithmetic number, because the mean of its divisors is an integer number (423584).

Almost surely, 2^12321100 is an apocalyptic number.

12321100 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 12321100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15249024).

12321100 is an abundant number, since it is smaller than the sum of its proper divisors (18176948).

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

12321100 is a wasteful number, since it uses less digits than its factorization.

12321100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535 (or 528 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 12321100 is about 3510.1424472520. The cubic root of 12321100 is about 230.9669436654.

Adding to 12321100 its reverse (112321), we get a palindrome (12433421).

It can be divided in two parts, 12321 and 100, that added together give a palindrome (12421).

The spelling of 12321100 in words is "twelve million, three hundred twenty-one thousand, one hundred".