133521442 has 4 divisors (see below), whose sum is σ = 200282166. Its totient is φ = 66760720.

The previous prime is 133521439. The next prime is 133521499. The reversal of 133521442 is 244125331.

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., 111534721 + 21986721 = 10561^2 + 4689^2 .

It is an unprimeable number.

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, 33380359 + ... + 33380362.

Almost surely, 2^133521442 is an apocalyptic number.

133521442 is a deficient number, since it is larger than the sum of its proper divisors (66760724).

133521442 is an equidigital number, since it uses as much as digits as its factorization.

133521442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66760723.

The product of its digits is 2880, while the sum is 25.

The square root of 133521442 is about 11555.1478571241. The cubic root of 133521442 is about 511.1130911111.

Adding to 133521442 its reverse (244125331), we get a palindrome (377646773).

The spelling of 133521442 in words is "one hundred thirty-three million, five hundred twenty-one thousand, four hundred forty-two".