21143032432 has 20 divisors (see below), whose sum is σ = 40972618656. Its totient is φ = 10569453440.

The previous prime is 21143032423. The next prime is 21143032453. The reversal of 21143032432 is 23423034112.

It is a junction number, because it is equal to n+sod(n) for n = 21143032397 and 21143032406.

It is a congruent number.

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, 42613 + ... + 210004.

Almost surely, 2^21143032432 is an apocalyptic number.

It is an amenable number.

21143032432 is a deficient number, since it is larger than the sum of its proper divisors (19829586224).

21143032432 is a wasteful number, since it uses less digits than its factorization.

21143032432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257856 (or 257850 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21143032432 its reverse (23423034112), we get a palindrome (44566066544).

The spelling of 21143032432 in words is "twenty-one billion, one hundred forty-three million, thirty-two thousand, four hundred thirty-two".