21304331112 has 64 divisors (see below), whose sum is σ = 54926424000. Its totient is φ = 6881692160.

The previous prime is 21304331101. The next prime is 21304331117. The reversal of 21304331112 is 21113340312.

It is not an unprimeable number, because it can be changed into a prime (21304331117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73963 + ... + 219269.

It is an arithmetic number, because the mean of its divisors is an integer number (858225375).

Almost surely, 2^21304331112 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 21304331112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27463212000).

21304331112 is an abundant number, since it is smaller than the sum of its proper divisors (33622092888).

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

21304331112 is a wasteful number, since it uses less digits than its factorization.

21304331112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145506 (or 145502 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21304331112 its reverse (21113340312), we get a palindrome (42417671424).

The spelling of 21304331112 in words is "twenty-one billion, three hundred four million, three hundred thirty-one thousand, one hundred twelve".