23212112221 has 2 divisors, whose sum is σ = 23212112222. Its totient is φ = 23212112220.

The previous prime is 23212112219. The next prime is 23212112237. The reversal of 23212112221 is 12221121232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22763265625 + 448846596 = 150875^2 + 21186^2 .

It is a cyclic number.

It is not a de Polignac number, because 23212112221 - 2¹ = 23212112219 is a prime.

Together with 23212112219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23212112281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11606056110 + 11606056111.

It is an arithmetic number, because the mean of its divisors is an integer number (11606056111).

Almost surely, 2^23212112221 is an apocalyptic number.

It is an amenable number.

23212112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23212112221 is an equidigital number, since it uses as much as digits as its factorization.

23212112221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 19.

Adding to 23212112221 its reverse (12221121232), we get a palindrome (35433233453).

The spelling of 23212112221 in words is "twenty-three billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty-one".