33420231 has 12 divisors (see below), whose sum is σ = 51987208. Its totient is φ = 20566224.

The previous prime is 33420217. The next prime is 33420241. The reversal of 33420231 is 13202433.

It is not a de Polignac number, because 33420231 - 2⁷ = 33420103 is a prime.

It is a super-2 number, since 2×33420231² = 2233823680186722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33420241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 142705 + ... + 142938.

Almost surely, 2^33420231 is an apocalyptic number.

33420231 is a deficient number, since it is larger than the sum of its proper divisors (18566977).

33420231 is a wasteful number, since it uses less digits than its factorization.

33420231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285662 (or 285659 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 33420231 is about 5781.0233523140. The cubic root of 33420231 is about 322.1092147820.

Adding to 33420231 its reverse (13202433), we get a palindrome (46622664).

The spelling of 33420231 in words is "thirty-three million, four hundred twenty thousand, two hundred thirty-one".