143328421 has 2 divisors, whose sum is σ = 143328422. Its totient is φ = 143328420.

The previous prime is 143328413. The next prime is 143328439. The reversal of 143328421 is 124823341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113188321 + 30140100 = 10639^2 + 5490^2 .

It is an emirp because it is prime and its reverse (124823341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143328421 - 2³ = 143328413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 143328421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143328401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71664210 + 71664211.

It is an arithmetic number, because the mean of its divisors is an integer number (71664211).

Almost surely, 2^143328421 is an apocalyptic number.

It is an amenable number.

143328421 is a deficient number, since it is larger than the sum of its proper divisors (1).

143328421 is an equidigital number, since it uses as much as digits as its factorization.

143328421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 28.

The square root of 143328421 is about 11971.9848396162. The cubic root of 143328421 is about 523.3321778636.

The spelling of 143328421 in words is "one hundred forty-three million, three hundred twenty-eight thousand, four hundred twenty-one".