21241244221 has 8 divisors (see below), whose sum is σ = 21371654304. Its totient is φ = 21111198000.

The previous prime is 21241244209. The next prime is 21241244231. The reversal of 21241244221 is 12244214212.

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 21241244221 - 2¹⁷ = 21241113149 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 (21241244231) 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, 26611 + ... + 207823.

It is an arithmetic number, because the mean of its divisors is an integer number (2671456788).

Almost surely, 2^21241244221 is an apocalyptic number.

It is an amenable number.

21241244221 is a deficient number, since it is larger than the sum of its proper divisors (130410083).

21241244221 is a wasteful number, since it uses less digits than its factorization.

21241244221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181931.

The product of its digits is 2048, while the sum is 25.

Adding to 21241244221 its reverse (12244214212), we get a palindrome (33485458433).

The spelling of 21241244221 in words is "twenty-one billion, two hundred forty-one million, two hundred forty-four thousand, two hundred twenty-one".