143345221 has 2 divisors, whose sum is σ = 143345222. Its totient is φ = 143345220.

The previous prime is 143345219. The next prime is 143345243. The reversal of 143345221 is 122543341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79121025 + 64224196 = 8895^2 + 8014^2 .

It is a cyclic number.

It is not a de Polignac number, because 143345221 - 2¹ = 143345219 is a prime.

Together with 143345219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143345201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71672610 + 71672611.

It is an arithmetic number, because the mean of its divisors is an integer number (71672611).

Almost surely, 2^143345221 is an apocalyptic number.

It is an amenable number.

143345221 is a deficient number, since it is larger than the sum of its proper divisors (1).

143345221 is an equidigital number, since it uses as much as digits as its factorization.

143345221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 25.

The square root of 143345221 is about 11972.6864570989. The cubic root of 143345221 is about 523.3526242320.

Adding to 143345221 its reverse (122543341), we get a palindrome (265888562).

The spelling of 143345221 in words is "one hundred forty-three million, three hundred forty-five thousand, two hundred twenty-one".