12821056 has 14 divisors (see below), whose sum is σ = 25441910. Its totient is φ = 6410496.

The previous prime is 12821047. The next prime is 12821059. The reversal of 12821056 is 65012821.

It can be written as a sum of positive squares in only one way, i.e., 12673600 + 147456 = 3560^2 + 384^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12821056.

It is not an unprimeable number, because it can be changed into a prime (12821059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100101 + ... + 100228.

Almost surely, 2^12821056 is an apocalyptic number.

12821056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12821056 is a deficient number, since it is larger than the sum of its proper divisors (12620854).

12821056 is an equidigital number, since it uses as much as digits as its factorization.

12821056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200341 (or 200331 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 12821056 is about 3580.6502202812. The cubic root of 12821056 is about 234.0496156997.

Adding to 12821056 its reverse (65012821), we get a palindrome (77833877).

The spelling of 12821056 in words is "twelve million, eight hundred twenty-one thousand, fifty-six".