21916223522 has 6 divisors (see below), whose sum is σ = 32874649329. Its totient is φ = 10958007080.

The previous prime is 21916223521. The next prime is 21916223573. The reversal of 21916223522 is 22532261912.

It can be written as a sum of positive squares in 2 ways, for example, as 20929698241 + 986525281 = 144671^2 + 31409^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=104681.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21916223521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 157022 + ... + 261702.

Almost surely, 2^21916223522 is an apocalyptic number.

21916223522 is a deficient number, since it is larger than the sum of its proper divisors (10958425807).

21916223522 is an frugal number, since it uses more digits than its factorization.

21916223522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209364 (or 104683 counting only the distinct ones).

The product of its digits is 25920, while the sum is 35.

The spelling of 21916223522 in words is "twenty-one billion, nine hundred sixteen million, two hundred twenty-three thousand, five hundred twenty-two".