21044141 has 4 divisors (see below), whose sum is σ = 21153372. Its totient is φ = 20934912.

The previous prime is 21044129. The next prime is 21044197. The reversal of 21044141 is 14144012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2468041 + 18576100 = 1571^2 + 4310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21044141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54326 + ... + 54711.

It is an arithmetic number, because the mean of its divisors is an integer number (5288343).

Almost surely, 2^21044141 is an apocalyptic number.

It is an amenable number.

21044141 is a deficient number, since it is larger than the sum of its proper divisors (109231).

21044141 is a wasteful number, since it uses less digits than its factorization.

21044141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109230.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 21044141 is about 4587.3893447145. The cubic root of 21044141 is about 276.0855865987.

Adding to 21044141 its reverse (14144012), we get a palindrome (35188153).

The spelling of 21044141 in words is "twenty-one million, forty-four thousand, one hundred forty-one".