20123323221 has 4 divisors (see below), whose sum is σ = 26831097632. Its totient is φ = 13415548812.

The previous prime is 20123323219. The next prime is 20123323261. The reversal of 20123323221 is 12232332102.

It is a happy number.

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 not a de Polignac number, because 20123323221 - 2¹ = 20123323219 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 (20123323261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3353887201 + ... + 3353887206.

It is an arithmetic number, because the mean of its divisors is an integer number (6707774408).

Almost surely, 2^20123323221 is an apocalyptic number.

It is an amenable number.

20123323221 is a deficient number, since it is larger than the sum of its proper divisors (6707774411).

20123323221 is an equidigital number, since it uses as much as digits as its factorization.

20123323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707774410.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20123323221 its reverse (12232332102), we get a palindrome (32355655323).

It can be divided in two parts, 2012 and 3323221, that added together give a palindrome (3325233).

The spelling of 20123323221 in words is "twenty billion, one hundred twenty-three million, three hundred twenty-three thousand, two hundred twenty-one".