33020221 has 8 divisors (see below), whose sum is σ = 35685720. Its totient is φ = 30372672.

The previous prime is 33020201. The next prime is 33020231. The reversal of 33020221 is 12202033.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6125625 + 26894596 = 2475^2 + 5186^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 33020221 - 2⁵ = 33020189 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33020201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526 + ... + 8143.

It is an arithmetic number, because the mean of its divisors is an integer number (4460715).

Almost surely, 2^33020221 is an apocalyptic number.

It is an amenable number.

33020221 is a deficient number, since it is larger than the sum of its proper divisors (2665499).

33020221 is a wasteful number, since it uses less digits than its factorization.

33020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8975.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 33020221 is about 5746.3223891459. The cubic root of 33020221 is about 320.8189343213.

Adding to 33020221 its reverse (12202033), we get a palindrome (45222254).

The spelling of 33020221 in words is "thirty-three million, twenty thousand, two hundred twenty-one".