33663421 has 32 divisors (see below), whose sum is σ = 41472000. Its totient is φ = 26959680.

The previous prime is 33663361. The next prime is 33663431. The reversal of 33663421 is 12436633.

It is not a de Polignac number, because 33663421 - 2¹³ = 33655229 is a prime.

It is a super-2 number, since 2×33663421² = 2266451826846482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33663421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33663431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 225855 + ... + 226003.

It is an arithmetic number, because the mean of its divisors is an integer number (1296000).

Almost surely, 2^33663421 is an apocalyptic number.

It is an amenable number.

33663421 is a deficient number, since it is larger than the sum of its proper divisors (7808579).

33663421 is a wasteful number, since it uses less digits than its factorization.

33663421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249.

The product of its digits is 7776, while the sum is 28.

The square root of 33663421 is about 5802.0187004180. The cubic root of 33663421 is about 322.8886279052. Note that the first 3 decimals are identical.

The spelling of 33663421 in words is "thirty-three million, six hundred sixty-three thousand, four hundred twenty-one".