20344043221 has 4 divisors (see below), whose sum is σ = 20349640492. Its totient is φ = 20338445952.

The previous prime is 20344043219. The next prime is 20344043273. The reversal of 20344043221 is 12234044302.

It is a happy number.

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 6223474321 + 14120568900 = 78889^2 + 118830^2 .

It is a cyclic number.

It is not a de Polignac number, because 20344043221 - 2¹ = 20344043219 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 (20344023221) 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, 2793180 + ... + 2800453.

It is an arithmetic number, because the mean of its divisors is an integer number (5087410123).

Almost surely, 2^20344043221 is an apocalyptic number.

It is an amenable number.

20344043221 is a deficient number, since it is larger than the sum of its proper divisors (5597271).

20344043221 is an equidigital number, since it uses as much as digits as its factorization.

20344043221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5597270.

The product of its (nonzero) digits is 4608, while the sum is 25.

Adding to 20344043221 its reverse (12234044302), we get a palindrome (32578087523).

The spelling of 20344043221 in words is "twenty billion, three hundred forty-four million, forty-three thousand, two hundred twenty-one".