21101303312 has 80 divisors (see below), whose sum is σ = 44361535680. Its totient is φ = 9684627456.

The previous prime is 21101303299. The next prime is 21101303357. The reversal of 21101303312 is 21330310112.

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 14724548 + ... + 14725980.

It is an arithmetic number, because the mean of its divisors is an integer number (554519196).

Almost surely, 2^21101303312 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 21101303312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22180767840).

21101303312 is an abundant number, since it is smaller than the sum of its proper divisors (23260232368).

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

21101303312 is a wasteful number, since it uses less digits than its factorization.

21101303312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760 (or 2754 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21101303312 its reverse (21330310112), we get a palindrome (42431613424).

The spelling of 21101303312 in words is "twenty-one billion, one hundred one million, three hundred three thousand, three hundred twelve".