143121221 has 2 divisors, whose sum is σ = 143121222. Its totient is φ = 143121220.

The previous prime is 143121193. The next prime is 143121229. The reversal of 143121221 is 122121341.

143121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139830625 + 3290596 = 11825^2 + 1814^2 .

It is a cyclic number.

It is not a de Polignac number, because 143121221 - 2¹⁴ = 143104837 is a prime.

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 143121221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143121229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71560610 + 71560611.

It is an arithmetic number, because the mean of its divisors is an integer number (71560611).

Almost surely, 2^143121221 is an apocalyptic number.

It is an amenable number.

143121221 is a deficient number, since it is larger than the sum of its proper divisors (1).

143121221 is an equidigital number, since it uses as much as digits as its factorization.

143121221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 17.

The square root of 143121221 is about 11963.3281740492. The cubic root of 143121221 is about 523.0798745159.

Adding to 143121221 its reverse (122121341), we get a palindrome (265242562).

The spelling of 143121221 in words is "one hundred forty-three million, one hundred twenty-one thousand, two hundred twenty-one".