21134844 has 120 divisors (see below), whose sum is σ = 59479728. Its totient is φ = 6531840.

The previous prime is 21134843. The next prime is 21134857. The reversal of 21134844 is 44843112.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134843) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 491487 + ... + 491529.

Almost surely, 2^21134844 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 21134844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29739864).

21134844 is an abundant number, since it is smaller than the sum of its proper divisors (38344884).

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

21134844 is a wasteful number, since it uses less digits than its factorization.

21134844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137 (or 126 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 21134844 is about 4597.2648390103. The cubic root of 21134844 is about 276.4816730765.

Adding to 21134844 its reverse (44843112), we get a palindrome (65977956).

The spelling of 21134844 in words is "twenty-one million, one hundred thirty-four thousand, eight hundred forty-four".