20344143221 has 4 divisors (see below), whose sum is σ = 20344462944. Its totient is φ = 20343823500.

The previous prime is 20344143199. The next prime is 20344143229. The reversal of 20344143221 is 12234144302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20344143221 - 2²⁶ = 20277034357 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 (20344143229) 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, 28355 + ... + 203696.

It is an arithmetic number, because the mean of its divisors is an integer number (5086115736).

Almost surely, 2^20344143221 is an apocalyptic number.

It is an amenable number.

20344143221 is a deficient number, since it is larger than the sum of its proper divisors (319723).

20344143221 is an equidigital number, since it uses as much as digits as its factorization.

20344143221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319722.

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 20344143221 its reverse (12234144302), we get a palindrome (32578287523).

The spelling of 20344143221 in words is "twenty billion, three hundred forty-four million, one hundred forty-three thousand, two hundred twenty-one".