20323012221 has 24 divisors (see below), whose sum is σ = 30690743616. Its totient is φ = 12934658880.

The previous prime is 20323012181. The next prime is 20323012231. The reversal of 20323012221 is 12221032302.

20323012221 is a `hidden beast` number, since 203 + 230 + 12 + 221 = 666.

It is not a de Polignac number, because 20323012221 - 2¹¹ = 20323010173 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20323012194 and 20323012203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20323012231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13626 + ... + 202068.

It is an arithmetic number, because the mean of its divisors is an integer number (1278780984).

Almost surely, 2^20323012221 is an apocalyptic number.

It is an amenable number.

20323012221 is a deficient number, since it is larger than the sum of its proper divisors (10367731395).

20323012221 is a wasteful number, since it uses less digits than its factorization.

20323012221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188993 (or 188990 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 20323012221 its reverse (12221032302), we get a palindrome (32544044523).

The spelling of 20323012221 in words is "twenty billion, three hundred twenty-three million, twelve thousand, two hundred twenty-one".