133332721 has 4 divisors (see below), whose sum is σ = 134182132. Its totient is φ = 132483312.

The previous prime is 133332713. The next prime is 133332733. The reversal of 133332721 is 127233331.

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

It can be written as a sum of positive squares in 2 ways, for example, as 74580496 + 58752225 = 8636^2 + 7665^2 .

It is a cyclic number.

It is not a de Polignac number, because 133332721 - 2³ = 133332713 is a prime.

It is a super-2 number, since 2×133332721² = 35555228978527682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (133332701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 424470 + ... + 424783.

It is an arithmetic number, because the mean of its divisors is an integer number (33545533).

Almost surely, 2^133332721 is an apocalyptic number.

It is an amenable number.

133332721 is a deficient number, since it is larger than the sum of its proper divisors (849411).

133332721 is an equidigital number, since it uses as much as digits as its factorization.

133332721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 849410.

The product of its digits is 2268, while the sum is 25.

The square root of 133332721 is about 11546.9788689510. The cubic root of 133332721 is about 510.8721728665.

The spelling of 133332721 in words is "one hundred thirty-three million, three hundred thirty-two thousand, seven hundred twenty-one".