21676794320 has 20 divisors (see below), whose sum is σ = 50398546980. Its totient is φ = 8670717696.

The previous prime is 21676794319. The next prime is 21676794331. The reversal of 21676794320 is 2349767612.

It can be written as a sum of positive squares in 2 ways, for example, as 10169512336 + 11507281984 = 100844^2 + 107272^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135479885 + ... + 135480044.

It is an arithmetic number, because the mean of its divisors is an integer number (2519927349).

Almost surely, 2^21676794320 is an apocalyptic number.

21676794320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21676794320 is an abundant number, since it is smaller than the sum of its proper divisors (28721752660).

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

21676794320 is a wasteful number, since it uses less digits than its factorization.

21676794320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270959942 (or 270959936 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 21676794320 in words is "twenty-one billion, six hundred seventy-six million, seven hundred ninety-four thousand, three hundred twenty".