33066821 has 4 divisors (see below), whose sum is σ = 34807200. Its totient is φ = 31326444.

The previous prime is 33066809. The next prime is 33066827. The reversal of 33066821 is 12866033.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12866033 = 109 ⋅118037.

It is a cyclic number.

It is not a de Polignac number, because 33066821 - 2¹⁰ = 33065797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33066827) 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, 870161 + ... + 870198.

It is an arithmetic number, because the mean of its divisors is an integer number (8701800).

Almost surely, 2^33066821 is an apocalyptic number.

It is an amenable number.

33066821 is a deficient number, since it is larger than the sum of its proper divisors (1740379).

33066821 is a wasteful number, since it uses less digits than its factorization.

33066821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740378.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 33066821 is about 5750.3757268547. The cubic root of 33066821 is about 320.9697826455.

The spelling of 33066821 in words is "thirty-three million, sixty-six thousand, eight hundred twenty-one".