21044134 has 12 divisors (see below), whose sum is σ = 33316164. Its totient is φ = 9967932.

The previous prime is 21044129. The next prime is 21044197. The reversal of 21044134 is 43144012.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 13852 + ... + 15295.

It is an arithmetic number, because the mean of its divisors is an integer number (2776347).

Almost surely, 2^21044134 is an apocalyptic number.

21044134 is a deficient number, since it is larger than the sum of its proper divisors (12272030).

21044134 is a wasteful number, since it uses less digits than its factorization.

21044134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29187 (or 29168 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 21044134 is about 4587.3885817532. The cubic root of 21044134 is about 276.0855559868.

Adding to 21044134 its reverse (43144012), we get a palindrome (64188146).

It can be divided in two parts, 210 and 44134, that added together give a palindrome (44344).

The spelling of 21044134 in words is "twenty-one million, forty-four thousand, one hundred thirty-four".