21044941 has 4 divisors (see below), whose sum is σ = 21060000. Its totient is φ = 21029884.

The previous prime is 21044927. The next prime is 21044987. The reversal of 21044941 is 14944012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21044941 - 2⁷ = 21044813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044911) 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, 5191 + ... + 8308.

It is an arithmetic number, because the mean of its divisors is an integer number (5265000).

Almost surely, 2^21044941 is an apocalyptic number.

It is an amenable number.

21044941 is a deficient number, since it is larger than the sum of its proper divisors (15059).

21044941 is a wasteful number, since it uses less digits than its factorization.

21044941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15058.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 21044941 is about 4587.4765394495. The cubic root of 21044941 is about 276.0890850494.

Adding to 21044941 its reverse (14944012), we get a palindrome (35988953).

The spelling of 21044941 in words is "twenty-one million, forty-four thousand, nine hundred forty-one".