33664421 has 12 divisors (see below), whose sum is σ = 39294432. Its totient is φ = 28840812.

The previous prime is 33664391. The next prime is 33664427. The reversal of 33664421 is 12446633.

It is not a de Polignac number, because 33664421 - 2¹⁴ = 33648037 is a prime.

It is a super-2 number, since 2×33664421² = 2266586482530482, 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 (33664427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15806 + ... + 17808.

It is an arithmetic number, because the mean of its divisors is an integer number (3274536).

Almost surely, 2^33664421 is an apocalyptic number.

It is an amenable number.

33664421 is a deficient number, since it is larger than the sum of its proper divisors (5630011).

33664421 is an frugal number, since it uses more digits than its factorization.

33664421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2038 (or 2010 counting only the distinct ones).

The product of its digits is 10368, while the sum is 29.

The square root of 33664421 is about 5802.1048766805. The cubic root of 33664421 is about 322.8918250988.

The spelling of 33664421 in words is "thirty-three million, six hundred sixty-four thousand, four hundred twenty-one".