21643676522 has 16 divisors (see below), whose sum is σ = 36482987520. Its totient is φ = 9555067632.

The previous prime is 21643676513. The next prime is 21643676543. The reversal of 21643676522 is 22567634612.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 18096122 + ... + 18097317.

It is an arithmetic number, because the mean of its divisors is an integer number (2280186720).

Almost surely, 2^21643676522 is an apocalyptic number.

21643676522 is a deficient number, since it is larger than the sum of its proper divisors (14839310998).

21643676522 is a wasteful number, since it uses less digits than its factorization.

21643676522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36193477.

The product of its digits is 725760, while the sum is 44.

The spelling of 21643676522 in words is "twenty-one billion, six hundred forty-three million, six hundred seventy-six thousand, five hundred twenty-two".