1221544224167 has 2 divisors, whose sum is σ = 1221544224168. Its totient is φ = 1221544224166.

The previous prime is 1221544224161. The next prime is 1221544224239. The reversal of 1221544224167 is 7614224451221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1221544224167 - 2¹⁰ = 1221544223143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221544224161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610772112083 + 610772112084.

It is an arithmetic number, because the mean of its divisors is an integer number (610772112084).

Almost surely, 2^{1221544224167} is an apocalyptic number.

1221544224167 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221544224167 is an equidigital number, since it uses as much as digits as its factorization.

1221544224167 is an evil number, because the sum of its binary digits is even.

The product of its digits is 215040, while the sum is 41.

Adding to 1221544224167 its reverse (7614224451221), we get a palindrome (8835768675388).

The spelling of 1221544224167 in words is "one trillion, two hundred twenty-one billion, five hundred forty-four million, two hundred twenty-four thousand, one hundred sixty-seven".