21344076 has 72 divisors (see below), whose sum is σ = 59164560. Its totient is φ = 6447744.

The previous prime is 21344051. The next prime is 21344077. The reversal of 21344076 is 67044312.

21344076 is a `hidden beast` number, since 213 + 440 + 7 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (21344077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27226 + ... + 27998.

It is an arithmetic number, because the mean of its divisors is an integer number (821730).

Almost surely, 2^21344076 is an apocalyptic number.

21344076 is a gapful number since it is divisible by the number (26) 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 21344076, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29582280).

21344076 is an abundant number, since it is smaller than the sum of its proper divisors (37820484).

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

21344076 is a wasteful number, since it uses less digits than its factorization.

21344076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 21344076 is about 4619.9649349319. The cubic root of 21344076 is about 277.3910553598.

Adding to 21344076 its reverse (67044312), we get a palindrome (88388388).

The spelling of 21344076 in words is "twenty-one million, three hundred forty-four thousand, seventy-six".