133721304 has 16 divisors (see below), whose sum is σ = 334303320. Its totient is φ = 44573760.

The previous prime is 133721299. The next prime is 133721339. The reversal of 133721304 is 403127331.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 5571721 = 133721304 / (1 + 3 + 3 + 7 + 2 + 1 + 3 + 0 + 4).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2785837 + ... + 2785884.

Almost surely, 2^133721304 is an apocalyptic number.

It is an amenable number.

133721304 is an abundant number, since it is smaller than the sum of its proper divisors (200582016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133721304 is a wasteful number, since it uses less digits than its factorization.

133721304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5571730 (or 5571726 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 24.

The square root of 133721304 is about 11563.7928034015. The cubic root of 133721304 is about 511.3679843990.

Adding to 133721304 its reverse (403127331), we get a palindrome (536848635).

The spelling of 133721304 in words is "one hundred thirty-three million, seven hundred twenty-one thousand, three hundred four".