144168221 has 2 divisors, whose sum is σ = 144168222. Its totient is φ = 144168220.

The previous prime is 144168217. The next prime is 144168239. The reversal of 144168221 is 122861441.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130188100 + 13980121 = 11410^2 + 3739^2 .

It is an emirp because it is prime and its reverse (122861441) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 144168221 - 2² = 144168217 is a prime.

It is a Chen prime.

It is equal to p_8134391 and since 144168221 and 8134391 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (144168281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72084110 + 72084111.

It is an arithmetic number, because the mean of its divisors is an integer number (72084111).

Almost surely, 2^144168221 is an apocalyptic number.

It is an amenable number.

144168221 is a deficient number, since it is larger than the sum of its proper divisors (1).

144168221 is an equidigital number, since it uses as much as digits as its factorization.

144168221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3072, while the sum is 29.

The square root of 144168221 is about 12007.0071624864. The cubic root of 144168221 is about 524.3523029977.

The spelling of 144168221 in words is "one hundred forty-four million, one hundred sixty-eight thousand, two hundred twenty-one".