21044534 has 8 divisors (see below), whose sum is σ = 36076368. Its totient is φ = 9019080.

The previous prime is 21044531. The next prime is 21044557. The reversal of 21044534 is 43544012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21044534² = 885744822554312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044531) 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 3 ways as a sum of consecutive naturals, for example, 751577 + ... + 751604.

It is an arithmetic number, because the mean of its divisors is an integer number (4509546).

Almost surely, 2^21044534 is an apocalyptic number.

21044534 is a deficient number, since it is larger than the sum of its proper divisors (15031834).

21044534 is a wasteful number, since it uses less digits than its factorization.

21044534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503190.

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 21044534 is about 4587.4321793352. The cubic root of 21044534 is about 276.0873052237.

Adding to 21044534 its reverse (43544012), we get a palindrome (64588546).

It can be divided in two parts, 210 and 44534, that added together give a palindrome (44744).

The spelling of 21044534 in words is "twenty-one million, forty-four thousand, five hundred thirty-four".