133216442 has 4 divisors (see below), whose sum is σ = 199824666. Its totient is φ = 66608220.

The previous prime is 133216427. The next prime is 133216453. The reversal of 133216442 is 244612331.

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., 84621601 + 48594841 = 9199^2 + 6971^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33304109 + ... + 33304112.

Almost surely, 2^133216442 is an apocalyptic number.

133216442 is a deficient number, since it is larger than the sum of its proper divisors (66608224).

133216442 is an equidigital number, since it uses as much as digits as its factorization.

133216442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66608223.

The product of its digits is 3456, while the sum is 26.

The square root of 133216442 is about 11541.9427307538. The cubic root of 133216442 is about 510.7236197284.

Adding to 133216442 its reverse (244612331), we get a palindrome (377828773).

The spelling of 133216442 in words is "one hundred thirty-three million, two hundred sixteen thousand, four hundred forty-two".