21967994880 has 544 divisors, whose sum is σ = 84556523520. Its totient is φ = 5379194880.

The previous prime is 21967994869. The next prime is 21967994891. The reversal of 21967994880 is 8849976912.

21967994880 is a `hidden beast` number, since 2 + 1 + 9 + 67 + 99 + 488 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21967994869) and next prime (21967994891).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 115015585 + ... + 115015775.

Almost surely, 2^21967994880 is an apocalyptic number.

21967994880 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 21967994880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42278261760).

21967994880 is an abundant number, since it is smaller than the sum of its proper divisors (62588528640).

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

21967994880 is an equidigital number, since it uses as much as digits as its factorization.

21967994880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250 (or 214 counting only the distinct ones).

The product of its (nonzero) digits is 15676416, while the sum is 63.

The spelling of 21967994880 in words is "twenty-one billion, nine hundred sixty-seven million, nine hundred ninety-four thousand, eight hundred eighty".