33133021 has 4 divisors (see below), whose sum is σ = 33586972. Its totient is φ = 32679072.

The previous prime is 33132977. The next prime is 33133027. The reversal of 33133021 is 12033133.

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 18156121 + 14976900 = 4261^2 + 3870^2 .

It is a cyclic number.

It is not a de Polignac number, because 33133021 - 2¹⁵ = 33100253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33132986 and 33133004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33133027) 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, 226866 + ... + 227011.

It is an arithmetic number, because the mean of its divisors is an integer number (8396743).

Almost surely, 2^33133021 is an apocalyptic number.

It is an amenable number.

33133021 is a deficient number, since it is larger than the sum of its proper divisors (453951).

33133021 is an equidigital number, since it uses as much as digits as its factorization.

33133021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453950.

The product of its (nonzero) digits is 162, while the sum is 16.

The square root of 33133021 is about 5756.1289943850. The cubic root of 33133021 is about 321.1838344255.

Adding to 33133021 its reverse (12033133), we get a palindrome (45166154).

The spelling of 33133021 in words is "thirty-three million, one hundred thirty-three thousand, twenty-one".