33973021 has 4 divisors (see below), whose sum is σ = 35971452. Its totient is φ = 31974592.

The previous prime is 33972997. The next prime is 33973033. The reversal of 33973021 is 12037933.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12037933 = 1181 ⋅10193.

It can be written as a sum of positive squares in 2 ways, for example, as 19456921 + 14516100 = 4411^2 + 3810^2 .

It is a cyclic number.

It is not a de Polignac number, because 33973021 - 2⁹ = 33972509 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 (33973091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 999190 + ... + 999223.

It is an arithmetic number, because the mean of its divisors is an integer number (8992863).

Almost surely, 2^33973021 is an apocalyptic number.

It is an amenable number.

33973021 is a deficient number, since it is larger than the sum of its proper divisors (1998431).

33973021 is a wasteful number, since it uses less digits than its factorization.

33973021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998430.

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 33973021 is about 5828.6380055721. The cubic root of 33973021 is about 323.8754697212.

The spelling of 33973021 in words is "thirty-three million, nine hundred seventy-three thousand, twenty-one".