33689221 has 4 divisors (see below), whose sum is σ = 33705772. Its totient is φ = 33672672.

The previous prime is 33689209. The next prime is 33689231. The reversal of 33689221 is 12298633.

It is a happy number.

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 21958596 + 11730625 = 4686^2 + 3425^2 .

It is a cyclic number.

It is not a de Polignac number, because 33689221 - 2²⁵ = 134789 is a prime.

It is a super-2 number, since 2×33689221² = 2269927223173682, 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 (33689231) 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, 4710 + ... + 9463.

It is an arithmetic number, because the mean of its divisors is an integer number (8426443).

Almost surely, 2^33689221 is an apocalyptic number.

It is an amenable number.

33689221 is a deficient number, since it is larger than the sum of its proper divisors (16551).

33689221 is a wasteful number, since it uses less digits than its factorization.

33689221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16550.

The product of its digits is 15552, while the sum is 34.

The square root of 33689221 is about 5804.2416386639. The cubic root of 33689221 is about 322.9710952546.

The spelling of 33689221 in words is "thirty-three million, six hundred eighty-nine thousand, two hundred twenty-one".