143022221 has 2 divisors, whose sum is σ = 143022222. Its totient is φ = 143022220.

The previous prime is 143022169. The next prime is 143022233. The reversal of 143022221 is 122220341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128006596 + 15015625 = 11314^2 + 3875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143022221 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 143022221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143024221) 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, 71511110 + 71511111.

It is an arithmetic number, because the mean of its divisors is an integer number (71511111).

Almost surely, 2^143022221 is an apocalyptic number.

It is an amenable number.

143022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

143022221 is an equidigital number, since it uses as much as digits as its factorization.

143022221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 143022221 is about 11959.1898136956. The cubic root of 143022221 is about 522.9592381955.

Adding to 143022221 its reverse (122220341), we get a palindrome (265242562).

The spelling of 143022221 in words is "one hundred forty-three million, twenty-two thousand, two hundred twenty-one".