33021993 has 8 divisors (see below), whose sum is σ = 44057728. Its totient is φ = 22000464.

The previous prime is 33021983. The next prime is 33022049. The reversal of 33021993 is 39912033.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 33021993 - 2¹³ = 33013801 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 33021993.

It is not an unprimeable number, because it can be changed into a prime (33021983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4455 + ... + 9267.

It is an arithmetic number, because the mean of its divisors is an integer number (5507216).

Almost surely, 2^33021993 is an apocalyptic number.

It is an amenable number.

33021993 is a deficient number, since it is larger than the sum of its proper divisors (11035735).

33021993 is a wasteful number, since it uses less digits than its factorization.

33021993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7103.

The product of its (nonzero) digits is 4374, while the sum is 30.

The square root of 33021993 is about 5746.4765726487. The cubic root of 33021993 is about 320.8246730370.

The spelling of 33021993 in words is "thirty-three million, twenty-one thousand, nine hundred ninety-three".