21715669080 has 480 divisors, whose sum is σ = 86907165840. Its totient is φ = 4846625280.

The previous prime is 21715669051. The next prime is 21715669091. The reversal of 21715669080 is 8096651712.

21715669080 is a `hidden beast` number, since 2 + 1 + 7 + 1 + 566 + 9 + 0 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 6825090 + ... + 6828270.

Almost surely, 2^21715669080 is an apocalyptic number.

21715669080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21715669080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43453582920).

21715669080 is an abundant number, since it is smaller than the sum of its proper divisors (65191496760).

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

21715669080 is a wasteful number, since it uses less digits than its factorization.

21715669080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261 (or 3241 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 21715669080 in words is "twenty-one billion, seven hundred fifteen million, six hundred sixty-nine thousand, eighty".