133721303 has 4 divisors (see below), whose sum is σ = 141587280. Its totient is φ = 125855328.

The previous prime is 133721299. The next prime is 133721339. The reversal of 133721303 is 303127331.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 133721303 - 2² = 133721299 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133721353) 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, 3932963 + ... + 3932996.

It is an arithmetic number, because the mean of its divisors is an integer number (35396820).

Almost surely, 2^133721303 is an apocalyptic number.

133721303 is a deficient number, since it is larger than the sum of its proper divisors (7865977).

133721303 is an equidigital number, since it uses as much as digits as its factorization.

133721303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7865976.

The product of its (nonzero) digits is 1134, while the sum is 23.

The square root of 133721303 is about 11563.7927601631. The cubic root of 133721303 is about 511.3679831243.

Adding to 133721303 its reverse (303127331), we get a palindrome (436848634).

The spelling of 133721303 in words is "one hundred thirty-three million, seven hundred twenty-one thousand, three hundred three".