21112300672 has 64 divisors (see below), whose sum is σ = 43568280000. Its totient is φ = 10178495488.

The previous prime is 21112300631. The next prime is 21112300681. The reversal of 21112300672 is 27600321112.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3110979 + ... + 3117757.

It is an arithmetic number, because the mean of its divisors is an integer number (680754375).

Almost surely, 2^21112300672 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 21112300672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21784140000).

21112300672 is an abundant number, since it is smaller than the sum of its proper divisors (22455979328).

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

21112300672 is an equidigital number, since it uses as much as digits as its factorization.

21112300672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7661 (or 7649 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 21112300672 its reverse (27600321112), we get a palindrome (48712621784).

The spelling of 21112300672 in words is "twenty-one billion, one hundred twelve million, three hundred thousand, six hundred seventy-two".