21320111232 has 192 divisors, whose sum is σ = 70773393600. Its totient is φ = 6034286592.

The previous prime is 21320111227. The next prime is 21320111237. The reversal of 21320111232 is 23211102312.

21320111232 is a `hidden beast` number, since 2 + 1 + 320 + 111 + 232 = 666.

It is an interprime number because it is at equal distance from previous prime (21320111227) and next prime (21320111237).

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (21320111237) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 850494 + ... + 875202.

It is an arithmetic number, because the mean of its divisors is an integer number (368611425).

Almost surely, 2^21320111232 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 21320111232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35386696800).

21320111232 is an abundant number, since it is smaller than the sum of its proper divisors (49453282368).

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

21320111232 is a wasteful number, since it uses less digits than its factorization.

21320111232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24843 (or 24828 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21320111232 its reverse (23211102312), we get a palindrome (44531213544).

The spelling of 21320111232 in words is "twenty-one billion, three hundred twenty million, one hundred eleven thousand, two hundred thirty-two".