12305550221 has 2 divisors, whose sum is σ = 12305550222. Its totient is φ = 12305550220.

The previous prime is 12305550209. The next prime is 12305550253. The reversal of 12305550221 is 12205550321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12256704100 + 48846121 = 110710^2 + 6989^2 .

It is an emirp because it is prime and its reverse (12205550321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12305550221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12305550281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6152775110 + 6152775111.

It is an arithmetic number, because the mean of its divisors is an integer number (6152775111).

Almost surely, 2^12305550221 is an apocalyptic number.

It is an amenable number.

12305550221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12305550221 is an equidigital number, since it uses as much as digits as its factorization.

12305550221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 12305550221 in words is "twelve billion, three hundred five million, five hundred fifty thousand, two hundred twenty-one".