21320444112 has 160 divisors (see below), whose sum is σ = 63674674560. Its totient is φ = 6085632000.

The previous prime is 21320444077. The next prime is 21320444191. The reversal of 21320444112 is 21144402312.

It is a super-2 number, since 2×21320444112² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 610812 + ... + 644772.

It is an arithmetic number, because the mean of its divisors is an integer number (397966716).

Almost surely, 2^21320444112 is an apocalyptic number.

21320444112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21320444112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31837337280).

21320444112 is an abundant number, since it is smaller than the sum of its proper divisors (42354230448).

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

21320444112 is a wasteful number, since it uses less digits than its factorization.

21320444112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34053 (or 34047 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21320444112 its reverse (21144402312), we get a palindrome (42464846424).

The spelling of 21320444112 in words is "twenty-one billion, three hundred twenty million, four hundred forty-four thousand, one hundred twelve".