33221665 has 8 divisors (see below), whose sum is σ = 39897000. Its totient is φ = 26556672.

The previous prime is 33221651. The next prime is 33221693. The reversal of 33221665 is 56612233.

It can be written as a sum of positive squares in 4 ways, for example, as 5438224 + 27783441 = 2332^2 + 5271^2 .

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 33221665 - 2⁷ = 33221537 is a prime.

It is a super-2 number, since 2×33221665² = 2207358050744450, which contains 22 as substring.

It is a zygodrome in base 7.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10711 + ... + 13459.

It is an arithmetic number, because the mean of its divisors is an integer number (4987125).

Almost surely, 2^33221665 is an apocalyptic number.

It is an amenable number.

33221665 is a deficient number, since it is larger than the sum of its proper divisors (6675335).

33221665 is a wasteful number, since it uses less digits than its factorization.

33221665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5171.

The product of its digits is 6480, while the sum is 28.

The square root of 33221665 is about 5763.8238175711. The cubic root of 33221665 is about 321.4700108360.

Adding to 33221665 its reverse (56612233), we get a palindrome (89833898).

The spelling of 33221665 in words is "thirty-three million, two hundred twenty-one thousand, six hundred sixty-five".