21022533 has 12 divisors (see below), whose sum is σ = 34703968. Its totient is φ = 12012840.

The previous prime is 21022517. The next prime is 21022541. The reversal of 21022533 is 33522012.

It is not a de Polignac number, because 21022533 - 2⁴ = 21022517 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 (21022553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 166783 + ... + 166908.

Almost surely, 2^21022533 is an apocalyptic number.

It is an amenable number.

21022533 is a deficient number, since it is larger than the sum of its proper divisors (13681435).

21022533 is a wasteful number, since it uses less digits than its factorization.

21022533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333704 (or 333701 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 21022533 is about 4585.0335876632. The cubic root of 21022533 is about 275.9910598869.

Adding to 21022533 its reverse (33522012), we get a palindrome (54544545).

The spelling of 21022533 in words is "twenty-one million, twenty-two thousand, five hundred thirty-three".