21676980672 has 56 divisors (see below), whose sum is σ = 63726314000. Its totient is φ = 7225659648.

The previous prime is 21676980659. The next prime is 21676980673. The reversal of 21676980672 is 27608967612.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21676980673) 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 7 ways as a sum of consecutive naturals, for example, 6270547 + ... + 6274002.

Almost surely, 2^21676980672 is an apocalyptic number.

It is an amenable number.

21676980672 is an abundant number, since it is smaller than the sum of its proper divisors (42049333328).

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

21676980672 is a wasteful number, since it uses less digits than its factorization.

21676980672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12544570 (or 12544554 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 21676980672 in words is "twenty-one billion, six hundred seventy-six million, nine hundred eighty thousand, six hundred seventy-two".