21320262216 has 192 divisors, whose sum is σ = 66426796800. Its totient is φ = 6109603200.

The previous prime is 21320262199. The next prime is 21320262221. The reversal of 21320262216 is 61226202312.

It is a happy number.

21320262216 is a `hidden beast` number, since 2 + 1 + 3 + 20 + 2 + 622 + 16 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21320262216.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12203055 + ... + 12204801.

It is an arithmetic number, because the mean of its divisors is an integer number (345972900).

Almost surely, 2^21320262216 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 21320262216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33213398400).

21320262216 is an abundant number, since it is smaller than the sum of its proper divisors (45106534584).

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

21320262216 is a wasteful number, since it uses less digits than its factorization.

21320262216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2600 (or 2593 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 21320262216 its reverse (61226202312), we get a palindrome (82546464528).

The spelling of 21320262216 in words is "twenty-one billion, three hundred twenty million, two hundred sixty-two thousand, two hundred sixteen".