21642316522 has 8 divisors (see below), whose sum is σ = 32474159172. Its totient is φ = 10817596800.

The previous prime is 21642316511. The next prime is 21642316523. The reversal of 21642316522 is 22561324612.

It can be written as a sum of positive squares in 2 ways, for example, as 17768623401 + 3873693121 = 133299^2 + 62239^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21642316523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1773129 + ... + 1785292.

Almost surely, 2^21642316522 is an apocalyptic number.

21642316522 is a deficient number, since it is larger than the sum of its proper divisors (10831842650).

21642316522 is a wasteful number, since it uses less digits than its factorization.

21642316522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561464.

The product of its digits is 34560, while the sum is 34.

The spelling of 21642316522 in words is "twenty-one billion, six hundred forty-two million, three hundred sixteen thousand, five hundred twenty-two".