21231010533 has 64 divisors (see below), whose sum is σ = 31183877120. Its totient is φ = 12802406400.

The previous prime is 21231010511. The next prime is 21231010547. The reversal of 21231010533 is 33501013212.

It is not a de Polignac number, because 21231010533 - 2⁵ = 21231010501 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 (21231010733) 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 63 ways as a sum of consecutive naturals, for example, 31546485 + ... + 31547157.

It is an arithmetic number, because the mean of its divisors is an integer number (487248080).

Almost surely, 2^21231010533 is an apocalyptic number.

It is an amenable number.

21231010533 is a deficient number, since it is larger than the sum of its proper divisors (9952866587).

21231010533 is a wasteful number, since it uses less digits than its factorization.

21231010533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010.

The product of its (nonzero) digits is 540, while the sum is 21.

Adding to 21231010533 its reverse (33501013212), we get a palindrome (54732023745).

The spelling of 21231010533 in words is "twenty-one billion, two hundred thirty-one million, ten thousand, five hundred thirty-three".