21938287360 has 288 divisors, whose sum is σ = 58890746880. Its totient is φ = 7828254720.

The previous prime is 21938287333. The next prime is 21938287391. The reversal of 21938287360 is 6378283912.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 134590639 + ... + 134590801.

It is an arithmetic number, because the mean of its divisors is an integer number (204481760).

Almost surely, 2^21938287360 is an apocalyptic number.

21938287360 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 21938287360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29445373440).

21938287360 is an abundant number, since it is smaller than the sum of its proper divisors (36952459520).

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

21938287360 is an equidigital number, since it uses as much as digits as its factorization.

21938287360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 49.

The spelling of 21938287360 in words is "twenty-one billion, nine hundred thirty-eight million, two hundred eighty-seven thousand, three hundred sixty".