33132721 has 4 divisors (see below), whose sum is σ = 33318000. Its totient is φ = 32947444.

The previous prime is 33132709. The next prime is 33132739. The reversal of 33132721 is 12723133.

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 not a de Polignac number, because 33132721 - 2¹⁵ = 33099953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33132692 and 33132701.

It is not an unprimeable number, because it can be changed into a prime (33102721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92371 + ... + 92728.

It is an arithmetic number, because the mean of its divisors is an integer number (8329500).

Almost surely, 2^33132721 is an apocalyptic number.

It is an amenable number.

33132721 is a deficient number, since it is larger than the sum of its proper divisors (185279).

33132721 is a wasteful number, since it uses less digits than its factorization.

33132721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185278.

The product of its digits is 756, while the sum is 22.

The square root of 33132721 is about 5756.1029351463. The cubic root of 33132721 is about 321.1828650457.

Adding to 33132721 its reverse (12723133), we get a palindrome (45855854).

The spelling of 33132721 in words is "thirty-three million, one hundred thirty-two thousand, seven hundred twenty-one".