20311423221 has 4 divisors (see below), whose sum is σ = 27081897632. Its totient is φ = 13540948812.

The previous prime is 20311423213. The next prime is 20311423229. The reversal of 20311423221 is 12232411302.

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 an interprime number because it is at equal distance from previous prime (20311423213) and next prime (20311423229).

It is not a de Polignac number, because 20311423221 - 2³ = 20311423213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20311423229) 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, 3385237201 + ... + 3385237206.

It is an arithmetic number, because the mean of its divisors is an integer number (6770474408).

Almost surely, 2^20311423221 is an apocalyptic number.

It is an amenable number.

20311423221 is a deficient number, since it is larger than the sum of its proper divisors (6770474411).

20311423221 is an equidigital number, since it uses as much as digits as its factorization.

20311423221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770474410.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 20311423221 its reverse (12232411302), we get a palindrome (32543834523).

The spelling of 20311423221 in words is "twenty billion, three hundred eleven million, four hundred twenty-three thousand, two hundred twenty-one".