21643462132 has 48 divisors (see below), whose sum is σ = 39549952512. Its totient is φ = 10354435200.

The previous prime is 21643462117. The next prime is 21643462151. The reversal of 21643462132 is 23126434612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2735382 + ... + 2743282.

It is an arithmetic number, because the mean of its divisors is an integer number (823957344).

Almost surely, 2^21643462132 is an apocalyptic number.

It is an amenable number.

21643462132 is a deficient number, since it is larger than the sum of its proper divisors (17906490380).

21643462132 is a wasteful number, since it uses less digits than its factorization.

21643462132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8248 (or 8246 counting only the distinct ones).

The product of its digits is 41472, while the sum is 34.

Adding to 21643462132 its reverse (23126434612), we get a palindrome (44769896744).

The spelling of 21643462132 in words is "twenty-one billion, six hundred forty-three million, four hundred sixty-two thousand, one hundred thirty-two".