143221142 has 4 divisors (see below), whose sum is σ = 214831716. Its totient is φ = 71610570.

The previous prime is 143221123. The next prime is 143221153. The reversal of 143221142 is 241122341.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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, 35805284 + ... + 35805287.

It is an arithmetic number, because the mean of its divisors is an integer number (53707929).

Almost surely, 2^143221142 is an apocalyptic number.

143221142 is a deficient number, since it is larger than the sum of its proper divisors (71610574).

143221142 is an equidigital number, since it uses as much as digits as its factorization.

143221142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71610573.

The product of its digits is 384, while the sum is 20.

The square root of 143221142 is about 11967.5035826191. The cubic root of 143221142 is about 523.2015767230.

Adding to 143221142 its reverse (241122341), we get a palindrome (384343483).

The spelling of 143221142 in words is "one hundred forty-three million, two hundred twenty-one thousand, one hundred forty-two".