21841630560 has 240 divisors, whose sum is σ = 77600188512. Its totient is φ = 5785344000.

The previous prime is 21841630513. The next prime is 21841630567. The reversal of 21841630560 is 6503614812.

It is a happy number.

21841630560 is a `hidden beast` number, since 2 + 1 + 84 + 16 + 3 + 0 + 560 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841630567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1951380 + ... + 1962540.

Almost surely, 2^21841630560 is an apocalyptic number.

21841630560 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 21841630560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38800094256).

21841630560 is an abundant number, since it is smaller than the sum of its proper divisors (55758557952).

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

21841630560 is a wasteful number, since it uses less digits than its factorization.

21841630560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11339 (or 11322 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 21841630560 in words is "twenty-one billion, eight hundred forty-one million, six hundred thirty thousand, five hundred sixty".