21322533 has 4 divisors (see below), whose sum is σ = 28430048. Its totient is φ = 14215020.

The previous prime is 21322493. The next prime is 21322547. The reversal of 21322533 is 33522312.

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 21322533 - 2⁸ = 21322277 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 (21324533) 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, 3553753 + ... + 3553758.

It is an arithmetic number, because the mean of its divisors is an integer number (7107512).

Almost surely, 2^21322533 is an apocalyptic number.

It is an amenable number.

21322533 is a deficient number, since it is larger than the sum of its proper divisors (7107515).

21322533 is an equidigital number, since it uses as much as digits as its factorization.

21322533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107514.

The product of its digits is 1080, while the sum is 21.

The square root of 21322533 is about 4617.6328351223. The cubic root of 21322533 is about 277.2976985092.

Adding to 21322533 its reverse (33522312), we get a palindrome (54844845).

The spelling of 21322533 in words is "twenty-one million, three hundred twenty-two thousand, five hundred thirty-three".