21441042221 has 8 divisors (see below), whose sum is σ = 22374783360. Its totient is φ = 20507427952.

The previous prime is 21441042197. The next prime is 21441042289. The reversal of 21441042221 is 12224014412.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21441042221 is a prime.

It is a super-2 number, since 2×21441042221² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441042521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 512531 + ... + 552783.

It is an arithmetic number, because the mean of its divisors is an integer number (2796847920).

Almost surely, 2^21441042221 is an apocalyptic number.

It is an amenable number.

21441042221 is a deficient number, since it is larger than the sum of its proper divisors (933741139).

21441042221 is a wasteful number, since it uses less digits than its factorization.

21441042221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63435.

The product of its (nonzero) digits is 1024, while the sum is 23.

Adding to 21441042221 its reverse (12224014412), we get a palindrome (33665056633).

The spelling of 21441042221 in words is "twenty-one billion, four hundred forty-one million, forty-two thousand, two hundred twenty-one".