20023311221 has 4 divisors (see below), whose sum is σ = 20023599744. Its totient is φ = 20023022700.

The previous prime is 20023311193. The next prime is 20023311241. The reversal of 20023311221 is 12211332002.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12211332002 = 2 ⋅6105666001.

It is a cyclic number.

It is not a de Polignac number, because 20023311221 - 2¹⁸ = 20023049077 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20023311221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20023311241) 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, 30026 + ... + 202356.

It is an arithmetic number, because the mean of its divisors is an integer number (5005899936).

Almost surely, 2^20023311221 is an apocalyptic number.

It is an amenable number.

20023311221 is a deficient number, since it is larger than the sum of its proper divisors (288523).

20023311221 is a wasteful number, since it uses less digits than its factorization.

20023311221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288522.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20023311221 its reverse (12211332002), we get a palindrome (32234643223).

The spelling of 20023311221 in words is "twenty billion, twenty-three million, three hundred eleven thousand, two hundred twenty-one".