21144441 has 8 divisors (see below), whose sum is σ = 28382400. Its totient is φ = 14001392.

The previous prime is 21144437. The next prime is 21144467. The reversal of 21144441 is 14444112.

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

It is a cyclic number.

It is not a de Polignac number, because 21144441 - 2² = 21144437 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21144341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23205 + ... + 24098.

It is an arithmetic number, because the mean of its divisors is an integer number (3547800).

Almost surely, 2^21144441 is an apocalyptic number.

It is an amenable number.

21144441 is a deficient number, since it is larger than the sum of its proper divisors (7237959).

21144441 is a wasteful number, since it uses less digits than its factorization.

21144441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47455.

The product of its digits is 512, while the sum is 21.

The square root of 21144441 is about 4598.3084933484. The cubic root of 21144441 is about 276.5235154025.

Adding to 21144441 its reverse (14444112), we get a palindrome (35588553).

It can be divided in two parts, 2114 and 4441, that added together give a triangular number (6555 = T₁₁₄).

The spelling of 21144441 in words is "twenty-one million, one hundred forty-four thousand, four hundred forty-one".