33430221 has 24 divisors (see below), whose sum is σ = 53909856. Its totient is φ = 19787040.

The previous prime is 33430181. The next prime is 33430223. The reversal of 33430221 is 12203433.

It is not a de Polignac number, because 33430221 - 2⁹ = 33429709 is a prime.

It is a super-2 number, since 2×33430221² = 2235159352217682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33430194 and 33430203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33430223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 331 + ... + 8183.

It is an arithmetic number, because the mean of its divisors is an integer number (2246244).

Almost surely, 2^33430221 is an apocalyptic number.

It is an amenable number.

33430221 is a deficient number, since it is larger than the sum of its proper divisors (20479635).

33430221 is a wasteful number, since it uses less digits than its factorization.

33430221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7913 (or 7910 counting only the distinct ones).

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

The square root of 33430221 is about 5781.8873216278. The cubic root of 33430221 is about 322.1413066256.

Adding to 33430221 its reverse (12203433), we get a palindrome (45633654).

The spelling of 33430221 in words is "thirty-three million, four hundred thirty thousand, two hundred twenty-one".