20323202221 has 6 divisors (see below), whose sum is σ = 23641276110. Its totient is φ = 17419887576.

The previous prime is 20323202173. The next prime is 20323202227. The reversal of 20323202221 is 12220232302.

It can be written as a sum of positive squares in only one way, i.e., 16593046596 + 3730155625 = 128814^2 + 61075^2 .

It is not a de Polignac number, because 20323202221 - 2¹¹ = 20323200173 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 (20323202227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 207379566 + ... + 207379663.

It is an arithmetic number, because the mean of its divisors is an integer number (3940212685).

Almost surely, 2^20323202221 is an apocalyptic number.

It is an amenable number.

20323202221 is a deficient number, since it is larger than the sum of its proper divisors (3318073889).

20323202221 is an equidigital number, since it uses as much as digits as its factorization.

20323202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414759243 (or 414759236 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 20323202221 its reverse (12220232302), we get a palindrome (32543434523).

The spelling of 20323202221 in words is "twenty billion, three hundred twenty-three million, two hundred two thousand, two hundred twenty-one".