133821056 has 32 divisors (see below), whose sum is σ = 267240000. Its totient is φ = 66749184.

The previous prime is 133821049. The next prime is 133821067. The reversal of 133821056 is 650128331.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65945 + ... + 67943.

It is an arithmetic number, because the mean of its divisors is an integer number (8351250).

Almost surely, 2^133821056 is an apocalyptic number.

133821056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

133821056 is a deficient number, since it is larger than the sum of its proper divisors (133418944).

133821056 is an equidigital number, since it uses as much as digits as its factorization.

133821056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2536 (or 2524 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 133821056 is about 11568.1051170881. The cubic root of 133821056 is about 511.4951077492.

Adding to 133821056 its reverse (650128331), we get a palindrome (783949387).

The spelling of 133821056 in words is "one hundred thirty-three million, eight hundred twenty-one thousand, fifty-six".