143323021 has 2 divisors, whose sum is σ = 143323022. Its totient is φ = 143323020.

The previous prime is 143322997. The next prime is 143323031. The reversal of 143323021 is 120323341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135978921 + 7344100 = 11661^2 + 2710^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143323021 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 143323021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143323031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71661510 + 71661511.

It is an arithmetic number, because the mean of its divisors is an integer number (71661511).

Almost surely, 2^143323021 is an apocalyptic number.

It is an amenable number.

143323021 is a deficient number, since it is larger than the sum of its proper divisors (1).

143323021 is an equidigital number, since it uses as much as digits as its factorization.

143323021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 143323021 is about 11971.7593109785. The cubic root of 143323021 is about 523.3256054773.

Adding to 143323021 its reverse (120323341), we get a palindrome (263646362).

The spelling of 143323021 in words is "one hundred forty-three million, three hundred twenty-three thousand, twenty-one".