143224021 has 2 divisors, whose sum is σ = 143224022. Its totient is φ = 143224020.

The previous prime is 143224009. The next prime is 143224027. The reversal of 143224021 is 120422341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90820900 + 52403121 = 9530^2 + 7239^2 .

It is a cyclic number.

It is not a de Polignac number, because 143224021 - 2⁷ = 143223893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 143224021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143224027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71612010 + 71612011.

It is an arithmetic number, because the mean of its divisors is an integer number (71612011).

Almost surely, 2^143224021 is an apocalyptic number.

It is an amenable number.

143224021 is a deficient number, since it is larger than the sum of its proper divisors (1).

143224021 is an equidigital number, since it uses as much as digits as its factorization.

143224021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 143224021 is about 11967.6238660814. The cubic root of 143224021 is about 523.2050824606.

Adding to 143224021 its reverse (120422341), we get a palindrome (263646362).

The spelling of 143224021 in words is "one hundred forty-three million, two hundred twenty-four thousand, twenty-one".