13821056 has 32 divisors (see below), whose sum is σ = 28988400. Its totient is φ = 6545664.

The previous prime is 13821053. The next prime is 13821061. The reversal of 13821056 is 65012831.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (13821053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 410 + ... + 5273.

Almost surely, 2^13821056 is an apocalyptic number.

13821056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13821056 is an abundant number, since it is smaller than the sum of its proper divisors (15167344).

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

13821056 is an equidigital number, since it uses as much as digits as its factorization.

13821056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5716 (or 5704 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 13821056 is about 3717.6680863143. The cubic root of 13821056 is about 239.9829617534.

Adding to 13821056 its reverse (65012831), we get a palindrome (78833887).

The spelling of 13821056 in words is "thirteen million, eight hundred twenty-one thousand, fifty-six".