21713887888 has 80 divisors (see below), whose sum is σ = 52553957760. Its totient is φ = 8443468800.

The previous prime is 21713887883. The next prime is 21713887901. The reversal of 21713887888 is 88878831712.

It is not an unprimeable number, because it can be changed into a prime (21713887883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624958 + ... + 658786.

It is an arithmetic number, because the mean of its divisors is an integer number (656924472).

Almost surely, 2^21713887888 is an apocalyptic number.

21713887888 is a gapful number since it is divisible by the number (28) 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 21713887888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26276978880).

21713887888 is an abundant number, since it is smaller than the sum of its proper divisors (30840069872).

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

21713887888 is a wasteful number, since it uses less digits than its factorization.

21713887888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34376 (or 34370 counting only the distinct ones).

The product of its digits is 9633792, while the sum is 61.

The spelling of 21713887888 in words is "twenty-one billion, seven hundred thirteen million, eight hundred eighty-seven thousand, eight hundred eighty-eight".