20223231221 has 2 divisors, whose sum is σ = 20223231222. Its totient is φ = 20223231220.

The previous prime is 20223231211. The next prime is 20223231233. The reversal of 20223231221 is 12213232202.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20132772100 + 90459121 = 141890^2 + 9511^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20223231221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20223231193 and 20223231202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20223231211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10111615610 + 10111615611.

It is an arithmetic number, because the mean of its divisors is an integer number (10111615611).

Almost surely, 2^20223231221 is an apocalyptic number.

It is an amenable number.

20223231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20223231221 is an equidigital number, since it uses as much as digits as its factorization.

20223231221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20223231221 its reverse (12213232202), we get a palindrome (32436463423).

The spelling of 20223231221 in words is "twenty billion, two hundred twenty-three million, two hundred thirty-one thousand, two hundred twenty-one".