33442221 has 8 divisors (see below), whose sum is σ = 44863840. Its totient is φ = 22157712.

The previous prime is 33442219. The next prime is 33442231. The reversal of 33442221 is 12224433.

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

It is not a de Polignac number, because 33442221 - 2¹ = 33442219 is a prime.

It is a super-2 number, since 2×33442221² = 2236764290825682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33442231) 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, 33706 + ... + 34683.

It is an arithmetic number, because the mean of its divisors is an integer number (5607980).

Almost surely, 2^33442221 is an apocalyptic number.

It is an amenable number.

33442221 is a deficient number, since it is larger than the sum of its proper divisors (11421619).

33442221 is a wasteful number, since it uses less digits than its factorization.

33442221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68555.

The product of its digits is 1152, while the sum is 21.

The square root of 33442221 is about 5782.9249519599. The cubic root of 33442221 is about 322.1798469355.

Adding to 33442221 its reverse (12224433), we get a palindrome (45666654).

It can be divided in two parts, 3344 and 2221, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 33442221 in words is "thirty-three million, four hundred forty-two thousand, two hundred twenty-one".