21688546272 has 48 divisors (see below), whose sum is σ = 57048509952. Its totient is φ = 7214775680.

The previous prime is 21688546267. The next prime is 21688546289. The reversal of 21688546272 is 27264588612.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182928 + ... + 277199.

It is an arithmetic number, because the mean of its divisors is an integer number (1188510624).

Almost surely, 2^21688546272 is an apocalyptic number.

It is an amenable number.

21688546272 is an abundant number, since it is smaller than the sum of its proper divisors (35359963680).

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

21688546272 is a wasteful number, since it uses less digits than its factorization.

21688546272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460631 (or 460623 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 51.

The spelling of 21688546272 in words is "twenty-one billion, six hundred eighty-eight million, five hundred forty-six thousand, two hundred seventy-two".