20231211232221 has 32 divisors (see below), whose sum is σ = 29440306544640. Its totient is φ = 12255887131200.

The previous prime is 20231211232187. The next prime is 20231211232273. The reversal of 20231211232221 is 12223211213202.

It is not a de Polignac number, because 20231211232221 - 2¹¹ = 20231211230173 is a prime.

It is a super-3 number, since 3×20231211232221³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20231211232191 and 20231211232200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20231211239221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1155466215 + ... + 1155483723.

It is an arithmetic number, because the mean of its divisors is an integer number (920009579520).

Almost surely, 2^{20231211232221} is an apocalyptic number.

It is an amenable number.

20231211232221 is a deficient number, since it is larger than the sum of its proper divisors (9209095312419).

20231211232221 is a wasteful number, since it uses less digits than its factorization.

20231211232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31097.

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 20231211232221 its reverse (12223211213202), we get a palindrome (32454422445423).

The spelling of 20231211232221 in words is "twenty trillion, two hundred thirty-one billion, two hundred eleven million, two hundred thirty-two thousand, two hundred twenty-one".