21101101328 has 80 divisors (see below), whose sum is σ = 43373890560. Its totient is φ = 9928396800.

The previous prime is 21101101327. The next prime is 21101101349. The reversal of 21101101328 is 82310110112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21101101321) 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, 6851693 + ... + 6854771.

It is an arithmetic number, because the mean of its divisors is an integer number (542173632).

Almost surely, 2^21101101328 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 21101101328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21686945280).

21101101328 is an abundant number, since it is smaller than the sum of its proper divisors (22272789232).

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

21101101328 is a wasteful number, since it uses less digits than its factorization.

21101101328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496 (or 3490 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 20.

The spelling of 21101101328 in words is "twenty-one billion, one hundred one million, one hundred one thousand, three hundred twenty-eight".