21232144536 has 32 divisors (see below), whose sum is σ = 53627587440. Its totient is φ = 7004418048.

The previous prime is 21232144513. The next prime is 21232144547. The reversal of 21232144536 is 63544123212.

It is a junction number, because it is equal to n+sod(n) for n = 21232144497 and 21232144506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4557841 + ... + 4562496.

Almost surely, 2^21232144536 is an apocalyptic number.

It is an amenable number.

21232144536 is an abundant number, since it is smaller than the sum of its proper divisors (32395442904).

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

21232144536 is a wasteful number, since it uses less digits than its factorization.

21232144536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9120443 (or 9120439 counting only the distinct ones).

The product of its digits is 34560, while the sum is 33.

Adding to 21232144536 its reverse (63544123212), we get a palindrome (84776267748).

The spelling of 21232144536 in words is "twenty-one billion, two hundred thirty-two million, one hundred forty-four thousand, five hundred thirty-six".