21143204432 has 60 divisors (see below), whose sum is σ = 47694242016. Its totient is φ = 9053553600.

The previous prime is 21143204429. The next prime is 21143204441. The reversal of 21143204432 is 23440234112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 947807 + ... + 969857.

Almost surely, 2^21143204432 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21143204432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23847121008).

21143204432 is an abundant number, since it is smaller than the sum of its proper divisors (26551037584).

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

21143204432 is a wasteful number, since it uses less digits than its factorization.

21143204432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23296 (or 23283 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 21143204432 its reverse (23440234112), we get a palindrome (44583438544).

The spelling of 21143204432 in words is "twenty-one billion, one hundred forty-three million, two hundred four thousand, four hundred thirty-two".