133632221 has 4 divisors (see below), whose sum is σ = 133657500. Its totient is φ = 133606944.

The previous prime is 133632217. The next prime is 133632259. The reversal of 133632221 is 122236331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23088025 + 110544196 = 4805^2 + 10514^2 .

It is a cyclic number.

It is not a de Polignac number, because 133632221 - 2² = 133632217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133631221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1346 + ... + 16403.

It is an arithmetic number, because the mean of its divisors is an integer number (33414375).

Almost surely, 2^133632221 is an apocalyptic number.

It is an amenable number.

133632221 is a deficient number, since it is larger than the sum of its proper divisors (25279).

133632221 is an equidigital number, since it uses as much as digits as its factorization.

133632221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25278.

The product of its digits is 1296, while the sum is 23.

The square root of 133632221 is about 11559.9403545174. The cubic root of 133632221 is about 511.2544041084.

Adding to 133632221 its reverse (122236331), we get a palindrome (255868552).

The spelling of 133632221 in words is "one hundred thirty-three million, six hundred thirty-two thousand, two hundred twenty-one".