21222012032 has 32 divisors (see below), whose sum is σ = 45530401980. Its totient is φ = 9794774016.

The previous prime is 21222011969. The next prime is 21222012047. The reversal of 21222012032 is 23021022212.

It can be written as a sum of positive squares in 2 ways, for example, as 20960090176 + 261921856 = 144776^2 + 16184^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21222012032.

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, 6375143 + ... + 6378470.

Almost surely, 2^21222012032 is an apocalyptic number.

It is an amenable number.

21222012032 is an abundant number, since it is smaller than the sum of its proper divisors (24308389948).

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

21222012032 is a wasteful number, since it uses less digits than its factorization.

21222012032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12753640 (or 12753628 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 21222012032 its reverse (23021022212), we get a palindrome (44243034244).

The spelling of 21222012032 in words is "twenty-one billion, two hundred twenty-two million, twelve thousand, thirty-two".