143442221 has 8 divisors (see below), whose sum is σ = 157391640. Its totient is φ = 129909312.

The previous prime is 143442203. The next prime is 143442227. The reversal of 143442221 is 122244341.

It can be written as a sum of positive squares in 4 ways, for example, as 902500 + 142539721 = 950^2 + 11939^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-143442221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143442227) 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 in 7 ways as a sum of consecutive naturals, for example, 103406 + ... + 104783.

It is an arithmetic number, because the mean of its divisors is an integer number (19673955).

Almost surely, 2^143442221 is an apocalyptic number.

It is an amenable number.

143442221 is a deficient number, since it is larger than the sum of its proper divisors (13949419).

143442221 is a wasteful number, since it uses less digits than its factorization.

143442221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208255.

The product of its digits is 1536, while the sum is 23.

The square root of 143442221 is about 11976.7366590403. The cubic root of 143442221 is about 523.4706464392.

Adding to 143442221 its reverse (122244341), we get a palindrome (265686562).

The spelling of 143442221 in words is "one hundred forty-three million, four hundred forty-two thousand, two hundred twenty-one".