133821456 has 20 divisors (see below), whose sum is σ = 345705552. Its totient is φ = 44607136.

The previous prime is 133821437. The next prime is 133821469. The reversal of 133821456 is 654128331.

133821456 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 1393926 + ... + 1394021.

Almost surely, 2^133821456 is an apocalyptic number.

133821456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

133821456 is an abundant number, since it is smaller than the sum of its proper divisors (211884096).

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

133821456 is a wasteful number, since it uses less digits than its factorization.

133821456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787958 (or 2787952 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 133821456 is about 11568.1224059914. The cubic root of 133821456 is about 511.4956173796.

Adding to 133821456 its reverse (654128331), we get a palindrome (787949787).

The spelling of 133821456 in words is "one hundred thirty-three million, eight hundred twenty-one thousand, four hundred fifty-six".