21112344 has 192 divisors, whose sum is σ = 69638400. Its totient is φ = 5702400.

The previous prime is 21112339. The next prime is 21112349. The reversal of 21112344 is 44321112.

It is an interprime number because it is at equal distance from previous prime (21112339) and next prime (21112349).

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112349) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 346074 + ... + 346134.

It is an arithmetic number, because the mean of its divisors is an integer number (362700).

Almost surely, 2^21112344 is an apocalyptic number.

21112344 is a gapful number since it is divisible by the number (24) 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 21112344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34819200).

21112344 is an abundant number, since it is smaller than the sum of its proper divisors (48526056).

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

21112344 is a wasteful number, since it uses less digits than its factorization.

21112344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 119 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21112344 is about 4594.8170801458. The cubic root of 21112344 is about 276.3835247848.

Adding to 21112344 its reverse (44321112), we get a palindrome (65433456).

The spelling of 21112344 in words is "twenty-one million, one hundred twelve thousand, three hundred forty-four".