33976021 has 4 divisors (see below), whose sum is σ = 34617132. Its totient is φ = 33334912.

The previous prime is 33975961. The next prime is 33976051. The reversal of 33976021 is 12067933.

33976021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27973521 + 6002500 = 5289^2 + 2450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33976021 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33976051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320476 + ... + 320581.

It is an arithmetic number, because the mean of its divisors is an integer number (8654283).

Almost surely, 2^33976021 is an apocalyptic number.

It is an amenable number.

33976021 is a deficient number, since it is larger than the sum of its proper divisors (641111).

33976021 is an equidigital number, since it uses as much as digits as its factorization.

33976021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641110.

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 33976021 is about 5828.8953498926. The cubic root of 33976021 is about 323.8850027544.

The spelling of 33976021 in words is "thirty-three million, nine hundred seventy-six thousand, twenty-one".