133221394 has 4 divisors (see below), whose sum is σ = 199832094. Its totient is φ = 66610696.

The previous prime is 133221373. The next prime is 133221397. The reversal of 133221394 is 493122331.

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

It can be written as a sum of positive squares in only one way, i.e., 133102369 + 119025 = 11537^2 + 345^2 .

It is not an unprimeable number, because it can be changed into a prime (133221397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33305347 + ... + 33305350.

Almost surely, 2^133221394 is an apocalyptic number.

133221394 is a deficient number, since it is larger than the sum of its proper divisors (66610700).

133221394 is an equidigital number, since it uses as much as digits as its factorization.

133221394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66610699.

The product of its digits is 3888, while the sum is 28.

The square root of 133221394 is about 11542.1572507049. The cubic root of 133221394 is about 510.7299479563.

The spelling of 133221394 in words is "one hundred thirty-three million, two hundred twenty-one thousand, three hundred ninety-four".