21224224432 has 40 divisors (see below), whose sum is σ = 42554307600. Its totient is φ = 10242715392.

The previous prime is 21224224429. The next prime is 21224224433. The reversal of 21224224432 is 23442242212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21224224432.

It is not an unprimeable number, because it can be changed into a prime (21224224433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1845163 + ... + 1856629.

It is an arithmetic number, because the mean of its divisors is an integer number (1063857690).

Almost surely, 2^21224224432 is an apocalyptic number.

It is an amenable number.

21224224432 is an abundant number, since it is smaller than the sum of its proper divisors (21330083168).

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

21224224432 is a wasteful number, since it uses less digits than its factorization.

21224224432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15493 (or 15487 counting only the distinct ones).

The product of its digits is 12288, while the sum is 28.

Adding to 21224224432 its reverse (23442242212), we get a palindrome (44666466644).

The spelling of 21224224432 in words is "twenty-one billion, two hundred twenty-four million, two hundred twenty-four thousand, four hundred thirty-two".