21041445 has 8 divisors (see below), whose sum is σ = 33666336. Its totient is φ = 11222096.

The previous prime is 21041441. The next prime is 21041453. The reversal of 21041445 is 54414012.

It is a happy number.

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 21041445 - 2² = 21041441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041441) 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, 701367 + ... + 701396.

It is an arithmetic number, because the mean of its divisors is an integer number (4208292).

Almost surely, 2^21041445 is an apocalyptic number.

It is an amenable number.

21041445 is a deficient number, since it is larger than the sum of its proper divisors (12624891).

21041445 is a wasteful number, since it uses less digits than its factorization.

21041445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402771.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 21041445 is about 4587.0954862527. The cubic root of 21041445 is about 276.0737961668.

Adding to 21041445 its reverse (54414012), we get a palindrome (75455457).

The spelling of 21041445 in words is "twenty-one million, forty-one thousand, four hundred forty-five".