23123333221 has 2 divisors, whose sum is σ = 23123333222. Its totient is φ = 23123333220.

The previous prime is 23123333213. The next prime is 23123333231. The reversal of 23123333221 is 12233332132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21974801121 + 1148532100 = 148239^2 + 33890^2 .

It is a cyclic number.

It is not a de Polignac number, because 23123333221 - 2³ = 23123333213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23123333231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11561666610 + 11561666611.

It is an arithmetic number, because the mean of its divisors is an integer number (11561666611).

Almost surely, 2^23123333221 is an apocalyptic number.

It is an amenable number.

23123333221 is a deficient number, since it is larger than the sum of its proper divisors (1).

23123333221 is an equidigital number, since it uses as much as digits as its factorization.

23123333221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 25.

Adding to 23123333221 its reverse (12233332132), we get a palindrome (35356665353).

The spelling of 23123333221 in words is "twenty-three billion, one hundred twenty-three million, three hundred thirty-three thousand, two hundred twenty-one".