21044122 has 16 divisors (see below), whose sum is σ = 34538400. Its totient is φ = 9537040.

The previous prime is 21044117. The next prime is 21044129. The reversal of 21044122 is 22144012.

It is a junction number, because it is equal to n+sod(n) for n = 21044096 and 21044105.

It is not an unprimeable number, because it can be changed into a prime (21044129) 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, 7329 + ... + 9787.

It is an arithmetic number, because the mean of its divisors is an integer number (2158650).

Almost surely, 2^21044122 is an apocalyptic number.

21044122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21044122 is a deficient number, since it is larger than the sum of its proper divisors (13494278).

21044122 is a wasteful number, since it uses less digits than its factorization.

21044122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21044122 is about 4587.3872738194. The cubic root of 21044122 is about 276.0855035094.

Adding to 21044122 its reverse (22144012), we get a palindrome (43188134).

It can be divided in two parts, 2104 and 4122, that added together give a palindrome (6226).

The spelling of 21044122 in words is "twenty-one million, forty-four thousand, one hundred twenty-two".