143312021 has 4 divisors (see below), whose sum is σ = 143402700. Its totient is φ = 143221344.

The previous prime is 143311981. The next prime is 143312047. The reversal of 143312021 is 120213341.

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

It can be written as a sum of positive squares in 2 ways, for example, as 90459121 + 52852900 = 9511^2 + 7270^2 .

It is a cyclic number.

It is not a de Polignac number, because 143312021 - 2¹⁰ = 143310997 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 (143314021) 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 3 ways as a sum of consecutive naturals, for example, 42926 + ... + 46143.

It is an arithmetic number, because the mean of its divisors is an integer number (35850675).

Almost surely, 2^143312021 is an apocalyptic number.

It is an amenable number.

143312021 is a deficient number, since it is larger than the sum of its proper divisors (90679).

143312021 is an equidigital number, since it uses as much as digits as its factorization.

143312021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90678.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 143312021 is about 11971.2998876480. The cubic root of 143312021 is about 523.3122167723.

Adding to 143312021 its reverse (120213341), we get a palindrome (263525362).

The spelling of 143312021 in words is "one hundred forty-three million, three hundred twelve thousand, twenty-one".