21441445 has 8 divisors (see below), whose sum is σ = 25915680. Its totient is φ = 17029200.

The previous prime is 21441421. The next prime is 21441449. The reversal of 21441445 is 54414412.

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

It is a de Polignac number, because none of the positive numbers 2^k-21441445 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14731 + ... + 16120.

It is an arithmetic number, because the mean of its divisors is an integer number (3239460).

Almost surely, 2^21441445 is an apocalyptic number.

It is an amenable number.

21441445 is a deficient number, since it is larger than the sum of its proper divisors (4474235).

21441445 is a wasteful number, since it uses less digits than its factorization.

21441445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30995.

The product of its digits is 2560, while the sum is 25.

The square root of 21441445 is about 4630.4907947214. The cubic root of 21441445 is about 277.8122233136.

Adding to 21441445 its reverse (54414412), we get a palindrome (75855857).

The spelling of 21441445 in words is "twenty-one million, four hundred forty-one thousand, four hundred forty-five".