144223721 has 2 divisors, whose sum is σ = 144223722. Its totient is φ = 144223720.

The previous prime is 144223711. The next prime is 144223747. The reversal of 144223721 is 127322441.

144223721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (144223747) can be obtained adding 144223721 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142468096 + 1755625 = 11936^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 144223721 - 2¹⁰ = 144222697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (144223711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72111860 + 72111861.

It is an arithmetic number, because the mean of its divisors is an integer number (72111861).

Almost surely, 2^144223721 is an apocalyptic number.

It is an amenable number.

144223721 is a deficient number, since it is larger than the sum of its proper divisors (1).

144223721 is an equidigital number, since it uses as much as digits as its factorization.

144223721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 26.

The square root of 144223721 is about 12009.3180905495. The cubic root of 144223721 is about 524.4195804671.

The spelling of 144223721 in words is "one hundred forty-four million, two hundred twenty-three thousand, seven hundred twenty-one".