133032221 has 4 divisors (see below), whose sum is σ = 152036832. Its totient is φ = 114027612.

The previous prime is 133032187. The next prime is 133032227. The reversal of 133032221 is 122230331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133032221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 133032221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133032227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9502295 + ... + 9502308.

It is an arithmetic number, because the mean of its divisors is an integer number (38009208).

Almost surely, 2^133032221 is an apocalyptic number.

It is an amenable number.

133032221 is a deficient number, since it is larger than the sum of its proper divisors (19004611).

133032221 is an equidigital number, since it uses as much as digits as its factorization.

133032221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19004610.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 133032221 is about 11533.9594675896. The cubic root of 133032221 is about 510.4880896956.

Adding to 133032221 its reverse (122230331), we get a palindrome (255262552).

The spelling of 133032221 in words is "one hundred thirty-three million, thirty-two thousand, two hundred twenty-one".