143212121 has 12 divisors (see below), whose sum is σ = 160428780. Its totient is φ = 127632960.

The previous prime is 143212109. The next prime is 143212159. The reversal of 143212121 is 121212341.

It can be written as a sum of positive squares in 6 ways, for example, as 58369600 + 84842521 = 7640^2 + 9211^2 .

It is not a de Polignac number, because 143212121 - 2¹⁴ = 143195737 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 143212121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143212171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9710 + ... + 19511.

It is an arithmetic number, because the mean of its divisors is an integer number (13369065).

Almost surely, 2^143212121 is an apocalyptic number.

It is an amenable number.

143212121 is a deficient number, since it is larger than the sum of its proper divisors (17216659).

143212121 is a wasteful number, since it uses less digits than its factorization.

143212121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29276 (or 29263 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 143212121 is about 11967.1266810375. The cubic root of 143212121 is about 523.1905916117.

Adding to 143212121 its reverse (121212341), we get a palindrome (264424462).

It can be divided in two parts, 143 and 212121, that multiplied together give a palindrome (30333303).

The spelling of 143212121 in words is "one hundred forty-three million, two hundred twelve thousand, one hundred twenty-one".