23331221009 has 2 divisors, whose sum is σ = 23331221010. Its totient is φ = 23331221008.

The previous prime is 23331221003. The next prime is 23331221059. The reversal of 23331221009 is 90012213332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14647776784 + 8683444225 = 121028^2 + 93185^2 .

It is a cyclic number.

It is not a de Polignac number, because 23331221009 - 2¹² = 23331216913 is a prime.

It is not a weakly prime, because it can be changed into another prime (23331221003) 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, 11665610504 + 11665610505.

It is an arithmetic number, because the mean of its divisors is an integer number (11665610505).

Almost surely, 2^23331221009 is an apocalyptic number.

It is an amenable number.

23331221009 is a deficient number, since it is larger than the sum of its proper divisors (1).

23331221009 is an equidigital number, since it uses as much as digits as its factorization.

23331221009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

The spelling of 23331221009 in words is "twenty-three billion, three hundred thirty-one million, two hundred twenty-one thousand, nine".