33011021 has 4 divisors (see below), whose sum is σ = 33156672. Its totient is φ = 32865372.

The previous prime is 33010987. The next prime is 33011023. The reversal of 33011021 is 12011033.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12011033 = 1723 ⋅6971.

It is a cyclic number.

It is not a de Polignac number, because 33011021 - 2¹⁰ = 33009997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33010993 and 33011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33011023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72485 + ... + 72938.

It is an arithmetic number, because the mean of its divisors is an integer number (8289168).

Almost surely, 2^33011021 is an apocalyptic number.

It is an amenable number.

33011021 is a deficient number, since it is larger than the sum of its proper divisors (145651).

33011021 is a wasteful number, since it uses less digits than its factorization.

33011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145650.

The product of its (nonzero) digits is 18, while the sum is 11.

The square root of 33011021 is about 5745.5218213840. The cubic root of 33011021 is about 320.7891363342.

Adding to 33011021 its reverse (12011033), we get a palindrome (45022054).

The spelling of 33011021 in words is "thirty-three million, eleven thousand, twenty-one".