21230250533 has 32 divisors (see below), whose sum is σ = 23695580160. Its totient is φ = 18929877120.

The previous prime is 21230250497. The next prime is 21230250557. The reversal of 21230250533 is 33505203212.

It is a cyclic number.

It is not a de Polignac number, because 21230250533 - 2⁶ = 21230250469 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 (21230250563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10191110 + ... + 10193192.

It is an arithmetic number, because the mean of its divisors is an integer number (740486880).

Almost surely, 2^21230250533 is an apocalyptic number.

21230250533 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21230250533 is a deficient number, since it is larger than the sum of its proper divisors (2465329627).

21230250533 is a wasteful number, since it uses less digits than its factorization.

21230250533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489.

The product of its (nonzero) digits is 5400, while the sum is 26.

Adding to 21230250533 its reverse (33505203212), we get a palindrome (54735453745).

The spelling of 21230250533 in words is "twenty-one billion, two hundred thirty million, two hundred fifty thousand, five hundred thirty-three".