21124344 has 32 divisors (see below), whose sum is σ = 53061120. Its totient is φ = 7008096.

The previous prime is 21124343. The next prime is 21124349. The reversal of 21124344 is 44342112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21124344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3379 + ... + 7325.

It is an arithmetic number, because the mean of its divisors is an integer number (1658160).

Almost surely, 2^21124344 is an apocalyptic number.

21124344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21124344 is an abundant number, since it is smaller than the sum of its proper divisors (31936776).

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

21124344 is a wasteful number, since it uses less digits than its factorization.

21124344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4179 (or 4175 counting only the distinct ones).

The product of its digits is 768, while the sum is 21.

The square root of 21124344 is about 4596.1227137665. The cubic root of 21124344 is about 276.4358792135.

Adding to 21124344 its reverse (44342112), we get a palindrome (65466456).

The spelling of 21124344 in words is "twenty-one million, one hundred twenty-four thousand, three hundred forty-four".