21543031132 has 24 divisors (see below), whose sum is σ = 44088066176. Its totient is φ = 9018012528.

The previous prime is 21543031099. The next prime is 21543031151. The reversal of 21543031132 is 23113034512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21543031097 and 21543031106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8945238 + ... + 8947645.

Almost surely, 2^21543031132 is an apocalyptic number.

It is an amenable number.

21543031132 is an abundant number, since it is smaller than the sum of its proper divisors (22545035044).

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

21543031132 is a wasteful number, since it uses less digits than its factorization.

21543031132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17892937 (or 17892935 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 21543031132 its reverse (23113034512), we get a palindrome (44656065644).

The spelling of 21543031132 in words is "twenty-one billion, five hundred forty-three million, thirty-one thousand, one hundred thirty-two".