12231543217 has 2 divisors, whose sum is σ = 12231543218. Its totient is φ = 12231543216.

The previous prime is 12231543187. The next prime is 12231543223. The reversal of 12231543217 is 71234513221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11743840161 + 487703056 = 108369^2 + 22084^2 .

It is a cyclic number.

It is not a de Polignac number, because 12231543217 - 2⁷ = 12231543089 is a prime.

It is a super-2 number, since 2×12231543217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12231543277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6115771608 + 6115771609.

It is an arithmetic number, because the mean of its divisors is an integer number (6115771609).

Almost surely, 2^12231543217 is an apocalyptic number.

It is an amenable number.

12231543217 is a deficient number, since it is larger than the sum of its proper divisors (1).

12231543217 is an equidigital number, since it uses as much as digits as its factorization.

12231543217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The spelling of 12231543217 in words is "twelve billion, two hundred thirty-one million, five hundred forty-three thousand, two hundred seventeen".