33021997 has 4 divisors (see below), whose sum is σ = 34457760. Its totient is φ = 31586236.

The previous prime is 33021983. The next prime is 33022049. The reversal of 33021997 is 79912033.

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 a cyclic number.

It is not a de Polignac number, because 33021997 - 2⁷ = 33021869 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 (33027997) 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, 717847 + ... + 717892.

It is an arithmetic number, because the mean of its divisors is an integer number (8614440).

Almost surely, 2^33021997 is an apocalyptic number.

It is an amenable number.

33021997 is a deficient number, since it is larger than the sum of its proper divisors (1435763).

33021997 is a wasteful number, since it uses less digits than its factorization.

33021997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435762.

The product of its (nonzero) digits is 10206, while the sum is 34.

The square root of 33021997 is about 5746.4769206880. The cubic root of 33021997 is about 320.8246859910.

The spelling of 33021997 in words is "thirty-three million, twenty-one thousand, nine hundred ninety-seven".