20211344043221 has 4 divisors (see below), whose sum is σ = 20212256253132. Its totient is φ = 20210431833312.

The previous prime is 20211344043203. The next prime is 20211344043229. The reversal of 20211344043221 is 12234044311202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11085477024196 + 9125867019025 = 3329486^2 + 3020905^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211344043221 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 (20211344043229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 456071720 + ... + 456116033.

It is an arithmetic number, because the mean of its divisors is an integer number (5053064063283).

Almost surely, 2^{20211344043221} is an apocalyptic number.

It is an amenable number.

20211344043221 is a deficient number, since it is larger than the sum of its proper divisors (912209911).

20211344043221 is an equidigital number, since it uses as much as digits as its factorization.

20211344043221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 912209910.

The product of its (nonzero) digits is 9216, while the sum is 29.

Adding to 20211344043221 its reverse (12234044311202), we get a palindrome (32445388354423).

The spelling of 20211344043221 in words is "twenty trillion, two hundred eleven billion, three hundred forty-four million, forty-three thousand, two hundred twenty-one".