33630021 has 6 divisors (see below), whose sum is σ = 48576710. Its totient is φ = 22420008.

The previous prime is 33630017. The next prime is 33630041. The reversal of 33630021 is 12003633.

It is a happy number.

33630021 is a `hidden beast` number, since 33 + 630 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 27941796 + 5688225 = 5286^2 + 2385^2 .

It is not a de Polignac number, because 33630021 - 2² = 33630017 is a prime.

It is a super-2 number, since 2×33630021² = 2261956624920882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33629976 and 33630003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33630001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1868326 + ... + 1868343.

Almost surely, 2^33630021 is an apocalyptic number.

It is an amenable number.

33630021 is a deficient number, since it is larger than the sum of its proper divisors (14946689).

33630021 is a wasteful number, since it uses less digits than its factorization.

33630021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3736675 (or 3736672 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 33630021 is about 5799.1396775729. The cubic root of 33630021 is about 322.7818052421.

Adding to 33630021 its reverse (12003633), we get a palindrome (45633654).

The spelling of 33630021 in words is "thirty-three million, six hundred thirty thousand, twenty-one".