133621056 has 112 divisors (see below), whose sum is σ = 400507200. Its totient is φ = 43670016.

The previous prime is 133621051. The next prime is 133621057. The reversal of 133621056 is 650126331.

133621056 is a `hidden beast` number, since 1 + 33 + 621 + 0 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133621051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90855 + ... + 92313.

Almost surely, 2^133621056 is an apocalyptic number.

133621056 is a gapful number since it is divisible by the number (16) 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 133621056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200253600).

133621056 is an abundant number, since it is smaller than the sum of its proper divisors (266886144).

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

133621056 is a wasteful number, since it uses less digits than its factorization.

133621056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533 (or 1517 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 133621056 is about 11559.4574267134. The cubic root of 133621056 is about 511.2401652410.

Adding to 133621056 its reverse (650126331), we get a palindrome (783747387).

The spelling of 133621056 in words is "one hundred thirty-three million, six hundred twenty-one thousand, fifty-six".