21676678256 has 80 divisors (see below), whose sum is σ = 45400219200. Its totient is φ = 9995403264.

The previous prime is 21676678249. The next prime is 21676678267. The reversal of 21676678256 is 65287667612.

Its product of digits (10160640) is a multiple of the sum of its prime divisors (2940).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12986990 + ... + 12988658.

It is an arithmetic number, because the mean of its divisors is an integer number (567502740).

Almost surely, 2^21676678256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21676678256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22700109600).

21676678256 is an abundant number, since it is smaller than the sum of its proper divisors (23723540944).

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

21676678256 is a wasteful number, since it uses less digits than its factorization.

21676678256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946 (or 2940 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 56.

The spelling of 21676678256 in words is "twenty-one billion, six hundred seventy-six million, six hundred seventy-eight thousand, two hundred fifty-six".