12218223971 has 2 divisors, whose sum is σ = 12218223972. Its totient is φ = 12218223970.

The previous prime is 12218223959. The next prime is 12218223991. The reversal of 12218223971 is 17932281221.

It is a weak prime.

It is an emirp because it is prime and its reverse (17932281221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12218223971 - 2⁶ = 12218223907 is a prime.

It is not a weakly prime, because it can be changed into another prime (12218223991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6109111985 + 6109111986.

It is an arithmetic number, because the mean of its divisors is an integer number (6109111986).

Almost surely, 2^12218223971 is an apocalyptic number.

12218223971 is a deficient number, since it is larger than the sum of its proper divisors (1).

12218223971 is an equidigital number, since it uses as much as digits as its factorization.

12218223971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The spelling of 12218223971 in words is "twelve billion, two hundred eighteen million, two hundred twenty-three thousand, nine hundred seventy-one".