21887522720 has 192 divisors, whose sum is σ = 64215244800. Its totient is φ = 6879790080.

The previous prime is 21887522711. The next prime is 21887522737. The reversal of 21887522720 is 2722578812.

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, 643091 + ... + 676269.

It is an arithmetic number, because the mean of its divisors is an integer number (334454400).

Almost surely, 2^21887522720 is an apocalyptic number.

21887522720 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 21887522720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32107622400).

21887522720 is an abundant number, since it is smaller than the sum of its proper divisors (42327722080).

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

21887522720 is a wasteful number, since it uses less digits than its factorization.

21887522720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33251 (or 33243 counting only the distinct ones).

The product of its (nonzero) digits is 250880, while the sum is 44.

The spelling of 21887522720 in words is "twenty-one billion, eight hundred eighty-seven million, five hundred twenty-two thousand, seven hundred twenty".