133828821 has 32 divisors (see below), whose sum is σ = 227953920. Its totient is φ = 76012992.

The previous prime is 133828819. The next prime is 133828831. The reversal of 133828821 is 128828331.

It is not a de Polignac number, because 133828821 - 2¹ = 133828819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133828801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30651 + ... + 34743.

It is an arithmetic number, because the mean of its divisors is an integer number (7123560).

Almost surely, 2^133828821 is an apocalyptic number.

It is an amenable number.

133828821 is a deficient number, since it is larger than the sum of its proper divisors (94125099).

133828821 is a wasteful number, since it uses less digits than its factorization.

133828821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4282 (or 4276 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 133828821 is about 11568.4407333054. The cubic root of 133828821 is about 511.5050007681.

The spelling of 133828821 in words is "one hundred thirty-three million, eight hundred twenty-eight thousand, eight hundred twenty-one".