12287247221 has 2 divisors, whose sum is σ = 12287247222.
Its totient is φ = 12287247220.
The previous prime is 12287247187. The next prime is 12287247223. The reversal of 12287247221 is 12274278221.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 9205443025 + 3081804196 = 95945^2 + 55514^2
It is a cyclic number.
It is not a de Polignac number, because 12287247221 - 210 = 12287246197 is a prime.
It is a Sophie Germain prime.
Together with 12287247223, it forms a pair of twin primes.
It is a Chen prime.
It is a Curzon number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (12287247223) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6143623610 + 6143623611.
It is an arithmetic number, because the mean of its divisors is an integer number (6143623611).
Almost surely, 212287247221 is an apocalyptic number.
It is an amenable number.
12287247221 is a deficient number, since it is larger than the sum of its proper divisors (1).
12287247221 is an equidigital number, since it uses as much as digits as its factorization.
12287247221 is an evil number, because the sum of its binary digits is even.
The product of its digits is 50176, while the sum is 38.
The spelling of 12287247221 in words is "twelve billion, two hundred eighty-seven million, two hundred forty-seven thousand, two hundred twenty-one".