143530021 has 2 divisors, whose sum is σ = 143530022. Its totient is φ = 143530020.

The previous prime is 143530003. The next prime is 143530039. The reversal of 143530021 is 120035341.

It is a balanced prime because it is at equal distance from previous prime (143530003) and next prime (143530039).

It can be written as a sum of positive squares in only one way, i.e., 74822500 + 68707521 = 8650^2 + 8289^2 .

It is a cyclic number.

It is not a de Polignac number, because 143530021 - 2¹¹ = 143527973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143530091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71765010 + 71765011.

It is an arithmetic number, because the mean of its divisors is an integer number (71765011).

Almost surely, 2^143530021 is an apocalyptic number.

It is an amenable number.

143530021 is a deficient number, since it is larger than the sum of its proper divisors (1).

143530021 is an equidigital number, since it uses as much as digits as its factorization.

143530021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 143530021 is about 11980.4015375112. The cubic root of 143530021 is about 523.5774289197.

Adding to 143530021 its reverse (120035341), we get a palindrome (263565362).

The spelling of 143530021 in words is "one hundred forty-three million, five hundred thirty thousand, twenty-one".