21232131232 has 48 divisors (see below), whose sum is σ = 47664229032. Its totient is φ = 9223004160.

The previous prime is 21232131223. The next prime is 21232131233. The reversal of 21232131232 is 23213123212.

It can be written as a sum of positive squares in 4 ways, for example, as 18866670736 + 2365460496 = 137356^2 + 48636^2 .

It is not an unprimeable number, because it can be changed into a prime (21232131233) 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, 1494069 + ... + 1508212.

Almost surely, 2^21232131232 is an apocalyptic number.

It is an amenable number.

21232131232 is an abundant number, since it is smaller than the sum of its proper divisors (26432097800).

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

21232131232 is a wasteful number, since it uses less digits than its factorization.

21232131232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3002321 (or 3002313 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

Adding to 21232131232 its reverse (23213123212), we get a palindrome (44445254444).

The spelling of 21232131232 in words is "twenty-one billion, two hundred thirty-two million, one hundred thirty-one thousand, two hundred thirty-two".