21103065888 has 96 divisors (see below), whose sum is σ = 55867262976. Its totient is φ = 6974677248.

The previous prime is 21103065877. The next prime is 21103065913. The reversal of 21103065888 is 88856030112.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7421395 + ... + 7424237.

It is an arithmetic number, because the mean of its divisors is an integer number (581950656).

Almost surely, 2^21103065888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21103065888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27933631488).

21103065888 is an abundant number, since it is smaller than the sum of its proper divisors (34764197088).

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

21103065888 is a wasteful number, since it uses less digits than its factorization.

21103065888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3486 (or 3478 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The spelling of 21103065888 in words is "twenty-one billion, one hundred three million, sixty-five thousand, eight hundred eighty-eight".