221231222867 has 2 divisors, whose sum is σ = 221231222868. Its totient is φ = 221231222866.

The previous prime is 221231222819. The next prime is 221231222869. The reversal of 221231222867 is 768222132122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221231222867 - 2¹² = 221231218771 is a prime.

Together with 221231222869, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221231222867.

It is not a weakly prime, because it can be changed into another prime (221231222869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110615611433 + 110615611434.

It is an arithmetic number, because the mean of its divisors is an integer number (110615611434).

Almost surely, 2^221231222867 is an apocalyptic number.

221231222867 is a deficient number, since it is larger than the sum of its proper divisors (1).

221231222867 is an equidigital number, since it uses as much as digits as its factorization.

221231222867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 38.

Adding to 221231222867 its reverse (768222132122), we get a palindrome (989453354989).

The spelling of 221231222867 in words is "two hundred twenty-one billion, two hundred thirty-one million, two hundred twenty-two thousand, eight hundred sixty-seven".