12021100 has 72 divisors (see below), whose sum is σ = 32129888. Its totient is φ = 3801600.

The previous prime is 12021071. The next prime is 12021131. The reversal of 12021100 is 112021.

It is a Harshad number since it is a multiple of its sum of digits (7).

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, 8440 + ... + 9760.

Almost surely, 2^12021100 is an apocalyptic number.

12021100 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 12021100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16064944).

12021100 is an abundant number, since it is smaller than the sum of its proper divisors (20108788).

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

12021100 is a wasteful number, since it uses less digits than its factorization.

12021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355 (or 1348 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 12021100 is about 3467.1458002224. The cubic root of 12021100 is about 229.0769558869.

Adding to 12021100 its reverse (112021), we get a palindrome (12133121).

It can be divided in two parts, 12021 and 100, that added together give a palindrome (12121).

The spelling of 12021100 in words is "twelve million, twenty-one thousand, one hundred".