21226026432 has 112 divisors (see below), whose sum is σ = 60522124320. Its totient is φ = 6526599168.

The previous prime is 21226026427. The next prime is 21226026457. The reversal of 21226026432 is 23462062212.

It is a self number, because there is not a number n which added to its sum of digits gives 21226026432.

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 15 ways as a sum of consecutive naturals, for example, 6869944 + ... + 6873032.

It is an arithmetic number, because the mean of its divisors is an integer number (540376110).

Almost surely, 2^21226026432 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 21226026432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30261062160).

21226026432 is an abundant number, since it is smaller than the sum of its proper divisors (39296097888).

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

21226026432 is a wasteful number, since it uses less digits than its factorization.

21226026432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5870 (or 5860 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 21226026432 its reverse (23462062212), we get a palindrome (44688088644).

The spelling of 21226026432 in words is "twenty-one billion, two hundred twenty-six million, twenty-six thousand, four hundred thirty-two".