12821172 has 96 divisors (see below), whose sum is σ = 37632000. Its totient is φ = 3307392.

The previous prime is 12821153. The next prime is 12821227. The reversal of 12821172 is 27112821.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64329 + ... + 64527.

It is an arithmetic number, because the mean of its divisors is an integer number (392000).

Almost surely, 2^12821172 is an apocalyptic number.

12821172 is a gapful number since it is divisible by the number (12) 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 12821172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18816000).

12821172 is an abundant number, since it is smaller than the sum of its proper divisors (24810828).

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

12821172 is a wasteful number, since it uses less digits than its factorization.

12821172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285 (or 283 counting only the distinct ones).

The product of its digits is 448, while the sum is 24.

The square root of 12821172 is about 3580.6664184199. Note that the first 3 decimals coincide. The cubic root of 12821172 is about 234.0503215613.

Adding to 12821172 its reverse (27112821), we get a palindrome (39933993).

The spelling of 12821172 in words is "twelve million, eight hundred twenty-one thousand, one hundred seventy-two".