33965921 has 4 divisors (see below), whose sum is σ = 37053744. Its totient is φ = 30878100.

The previous prime is 33965909. The next prime is 33965923. The reversal of 33965921 is 12956933.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 33965921 - 2⁶ = 33965857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (33965923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1543895 + ... + 1543916.

It is an arithmetic number, because the mean of its divisors is an integer number (9263436).

Almost surely, 2^33965921 is an apocalyptic number.

It is an amenable number.

33965921 is a deficient number, since it is larger than the sum of its proper divisors (3087823).

33965921 is a wasteful number, since it uses less digits than its factorization.

33965921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3087822.

The product of its digits is 43740, while the sum is 38.

The square root of 33965921 is about 5828.0289120765. The cubic root of 33965921 is about 323.8529059733.

The spelling of 33965921 in words is "thirty-three million, nine hundred sixty-five thousand, nine hundred twenty-one".