21022033 has 4 divisors (see below), whose sum is σ = 21132288. Its totient is φ = 20911780.

The previous prime is 21022021. The next prime is 21022049. The reversal of 21022033 is 33022012.

It is a happy number.

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 21022033 - 2²¹ = 18924881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21022063) 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, 54841 + ... + 55222.

It is an arithmetic number, because the mean of its divisors is an integer number (5283072).

Almost surely, 2^21022033 is an apocalyptic number.

It is an amenable number.

21022033 is a deficient number, since it is larger than the sum of its proper divisors (110255).

21022033 is a wasteful number, since it uses less digits than its factorization.

21022033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110254.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21022033 is about 4584.9790621114. The cubic root of 21022033 is about 275.9888718121.

Adding to 21022033 its reverse (33022012), we get a palindrome (54044045).

The spelling of 21022033 in words is "twenty-one million, twenty-two thousand, thirty-three".