33332721 has 4 divisors (see below), whose sum is σ = 44443632. Its totient is φ = 22221812.

The previous prime is 33332711. The next prime is 33332723. The reversal of 33332721 is 12723333.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33332721 is a prime.

It is a super-2 number, since 2×33332721² = 2222140578527682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33332691 and 33332700.

It is not an unprimeable number, because it can be changed into a prime (33332723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5555451 + ... + 5555456.

It is an arithmetic number, because the mean of its divisors is an integer number (11110908).

Almost surely, 2^33332721 is an apocalyptic number.

It is an amenable number.

33332721 is a deficient number, since it is larger than the sum of its proper divisors (11110911).

33332721 is a wasteful number, since it uses less digits than its factorization.

33332721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11110910.

The product of its digits is 2268, while the sum is 24.

The square root of 33332721 is about 5773.4496620305. The cubic root of 33332721 is about 321.8278241854.

The spelling of 33332721 in words is "thirty-three million, three hundred thirty-two thousand, seven hundred twenty-one".