21286722288 has 80 divisors (see below), whose sum is σ = 59260269600. Its totient is φ = 6545390592.

The previous prime is 21286722283. The next prime is 21286722319. The reversal of 21286722288 is 88222768212.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21286722283) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 995938 + ... + 1017086.

It is an arithmetic number, because the mean of its divisors is an integer number (740753370).

Almost surely, 2^21286722288 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 21286722288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29630134800).

21286722288 is an abundant number, since it is smaller than the sum of its proper divisors (37973547312).

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

21286722288 is a wasteful number, since it uses less digits than its factorization.

21286722288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22786 (or 22780 counting only the distinct ones).

The product of its digits is 688128, while the sum is 48.

The spelling of 21286722288 in words is "twenty-one billion, two hundred eighty-six million, seven hundred twenty-two thousand, two hundred eighty-eight".