143221131 has 12 divisors (see below), whose sum is σ = 208924560. Its totient is φ = 94534800.

The previous prime is 143221123. The next prime is 143221153. The reversal of 143221131 is 131122341.

It is not a de Polignac number, because 143221131 - 2³ = 143221123 is a prime.

It is a super-2 number, since 2×143221131² = 41024584729838322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (143221171) 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 11 ways as a sum of consecutive naturals, for example, 77871 + ... + 79688.

It is an arithmetic number, because the mean of its divisors is an integer number (17410380).

Almost surely, 2^143221131 is an apocalyptic number.

143221131 is a deficient number, since it is larger than the sum of its proper divisors (65703429).

143221131 is a wasteful number, since it uses less digits than its factorization.

143221131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157666 (or 157663 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 143221131 is about 11967.5031230412. The cubic root of 143221131 is about 523.2015633282.

Adding to 143221131 its reverse (131122341), we get a palindrome (274343472).

The spelling of 143221131 in words is "one hundred forty-three million, two hundred twenty-one thousand, one hundred thirty-one".