12821155 has 8 divisors (see below), whose sum is σ = 15451200. Its totient is φ = 10213056.

The previous prime is 12821153. The next prime is 12821227. The reversal of 12821155 is 55112821.

12821155 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12821155 - 2¹ = 12821153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12821153) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4170 + ... + 6559.

It is an arithmetic number, because the mean of its divisors is an integer number (1931400).

Almost surely, 2^12821155 is an apocalyptic number.

12821155 is a deficient number, since it is larger than the sum of its proper divisors (2630045).

12821155 is a wasteful number, since it uses less digits than its factorization.

12821155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10973.

The product of its digits is 800, while the sum is 25.

The square root of 12821155 is about 3580.6640445593. The cubic root of 12821155 is about 234.0502181163.

Adding to 12821155 its reverse (55112821), we get a palindrome (67933976).

The spelling of 12821155 in words is "twelve million, eight hundred twenty-one thousand, one hundred fifty-five".