12216542389 has 2 divisors, whose sum is σ = 12216542390. Its totient is φ = 12216542388.

The previous prime is 12216542381. The next prime is 12216542417. The reversal of 12216542389 is 98324561221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6493619889 + 5722922500 = 80583^2 + 75650^2 .

It is a cyclic number.

It is not a de Polignac number, because 12216542389 - 2³ = 12216542381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12216542381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6108271194 + 6108271195.

It is an arithmetic number, because the mean of its divisors is an integer number (6108271195).

Almost surely, 2^12216542389 is an apocalyptic number.

It is an amenable number.

12216542389 is a deficient number, since it is larger than the sum of its proper divisors (1).

12216542389 is an equidigital number, since it uses as much as digits as its factorization.

12216542389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 43.

The spelling of 12216542389 in words is "twelve billion, two hundred sixteen million, five hundred forty-two thousand, three hundred eighty-nine".