33966621 has 20 divisors (see below), whose sum is σ = 54645052. Its totient is φ = 20901888.

The previous prime is 33966601. The next prime is 33966637. The reversal of 33966621 is 12666933.

It can be written as a sum of positive squares in 2 ways, for example, as 6812100 + 27154521 = 2610^2 + 5211^2 .

It is not a de Polignac number, because 33966621 - 2⁵ = 33966589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33966601) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 15076 + ... + 17181.

Almost surely, 2^33966621 is an apocalyptic number.

It is an amenable number.

33966621 is a deficient number, since it is larger than the sum of its proper divisors (20678431).

33966621 is a wasteful number, since it uses less digits than its factorization.

33966621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32282 (or 32273 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 33966621 is about 5828.0889663765. The cubic root of 33966621 is about 323.8551307079.

The spelling of 33966621 in words is "thirty-three million, nine hundred sixty-six thousand, six hundred twenty-one".