21122533 has 4 divisors (see below), whose sum is σ = 22040928. Its totient is φ = 20204140.

The previous prime is 21122473. The next prime is 21122561. The reversal of 21122533 is 33522112.

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 21122533 - 2¹³ = 21114341 is a prime.

It is a super-2 number, since 2×21122533² = 892322800672178, which contains 22 as substring.

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 21122533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122033) 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, 459163 + ... + 459208.

It is an arithmetic number, because the mean of its divisors is an integer number (5510232).

Almost surely, 2^21122533 is an apocalyptic number.

21122533 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21122533 is a deficient number, since it is larger than the sum of its proper divisors (918395).

21122533 is an equidigital number, since it uses as much as digits as its factorization.

21122533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918394.

The product of its digits is 360, while the sum is 19.

The square root of 21122533 is about 4595.9256956570. The cubic root of 21122533 is about 276.4279793282.

Adding to 21122533 its reverse (33522112), we get a palindrome (54644645).

The spelling of 21122533 in words is "twenty-one million, one hundred twenty-two thousand, five hundred thirty-three".