21231021032 has 16 divisors (see below), whose sum is σ = 42870331140. Its totient is φ = 9798932736.

The previous prime is 21231021011. The next prime is 21231021041. The reversal of 21231021032 is 23012013212.

It can be written as a sum of positive squares in 2 ways, for example, as 17925460996 + 3305560036 = 133886^2 + 57494^2 .

It is a super-2 number, since 2×21231021032² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21231021032.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102072113 + ... + 102072320.

Almost surely, 2^21231021032 is an apocalyptic number.

It is an amenable number.

21231021032 is an abundant number, since it is smaller than the sum of its proper divisors (21639310108).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21231021032 is a wasteful number, since it uses less digits than its factorization.

21231021032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204144452 (or 204144448 counting only the distinct ones).

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

Adding to 21231021032 its reverse (23012013212), we get a palindrome (44243034244).

The spelling of 21231021032 in words is "twenty-one billion, two hundred thirty-one million, twenty-one thousand, thirty-two".