21545673676 has 12 divisors (see below), whose sum is σ = 38624561640. Its totient is φ = 10510084640.

The previous prime is 21545673671. The next prime is 21545673719. The reversal of 21545673676 is 67637654512.

It is not an unprimeable number, because it can be changed into a prime (21545673671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65687866 + ... + 65688193.

It is an arithmetic number, because the mean of its divisors is an integer number (3218713470).

Almost surely, 2^21545673676 is an apocalyptic number.

It is an amenable number.

21545673676 is a deficient number, since it is larger than the sum of its proper divisors (17078887964).

21545673676 is a wasteful number, since it uses less digits than its factorization.

21545673676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131376104 (or 131376102 counting only the distinct ones).

The product of its digits is 6350400, while the sum is 52.

The spelling of 21545673676 in words is "twenty-one billion, five hundred forty-five million, six hundred seventy-three thousand, six hundred seventy-six".