21011483712 has 112 divisors (see below), whose sum is σ = 56446643520. Its totient is φ = 6896590848.

The previous prime is 21011483677. The next prime is 21011483723. The reversal of 21011483712 is 21738411012.

It is a self number, because there is not a number n which added to its sum of digits gives 21011483712.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16299964 + ... + 16301252.

Almost surely, 2^21011483712 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 21011483712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28223321760).

21011483712 is an abundant number, since it is smaller than the sum of its proper divisors (35435159808).

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

21011483712 is a wasteful number, since it uses less digits than its factorization.

21011483712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2540 (or 2530 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

Adding to 21011483712 its reverse (21738411012), we get a palindrome (42749894724).

The spelling of 21011483712 in words is "twenty-one billion, eleven million, four hundred eighty-three thousand, seven hundred twelve".