21643667360 has 96 divisors (see below), whose sum is σ = 58490957952. Its totient is φ = 7413949440.

The previous prime is 21643667333. The next prime is 21643667363. The reversal of 21643667360 is 6376634612.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21643667363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1314539 + ... + 1330901.

It is an arithmetic number, because the mean of its divisors is an integer number (609280812).

Almost surely, 2^21643667360 is an apocalyptic number.

21643667360 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 21643667360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29245478976).

21643667360 is an abundant number, since it is smaller than the sum of its proper divisors (36847290592).

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

21643667360 is a wasteful number, since it uses less digits than its factorization.

21643667360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17566 (or 17558 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 44.

The spelling of 21643667360 in words is "twenty-one billion, six hundred forty-three million, six hundred sixty-seven thousand, three hundred sixty".