21703566522 has 64 divisors (see below), whose sum is σ = 47953814400. Its totient is φ = 6493639680.

The previous prime is 21703566463. The next prime is 21703566529. The reversal of 21703566522 is 22566530712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21703566529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4867318 + ... + 4871774.

It is an arithmetic number, because the mean of its divisors is an integer number (749278350).

Almost surely, 2^21703566522 is an apocalyptic number.

21703566522 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21703566522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23976907200).

21703566522 is an abundant number, since it is smaller than the sum of its proper divisors (26250247878).

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

21703566522 is a wasteful number, since it uses less digits than its factorization.

21703566522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5391.

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 21703566522 in words is "twenty-one billion, seven hundred three million, five hundred sixty-six thousand, five hundred twenty-two".