21231010232 has 32 divisors (see below), whose sum is σ = 41224740480. Its totient is φ = 10243695840.

The previous prime is 21231010231. The next prime is 21231010237. The reversal of 21231010232 is 23201013212.

It is a self number, because there is not a number n which added to its sum of digits gives 21231010232.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21231010231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343244 + ... + 400347.

It is an arithmetic number, because the mean of its divisors is an integer number (1288273140).

Almost surely, 2^21231010232 is an apocalyptic number.

It is an amenable number.

21231010232 is a deficient number, since it is larger than the sum of its proper divisors (19993730248).

21231010232 is a wasteful number, since it uses less digits than its factorization.

21231010232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743723 (or 743719 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21231010232 its reverse (23201013212), we get a palindrome (44432023444).

The spelling of 21231010232 in words is "twenty-one billion, two hundred thirty-one million, ten thousand, two hundred thirty-two".