143147021 has 4 divisors (see below), whose sum is σ = 151567452. Its totient is φ = 134726592.

The previous prime is 143146999. The next prime is 143147023. The reversal of 143147021 is 120741341.

It is a happy number.

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 84456100 + 58690921 = 9190^2 + 7661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143147021 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 (143147023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4210190 + ... + 4210223.

It is an arithmetic number, because the mean of its divisors is an integer number (37891863).

Almost surely, 2^143147021 is an apocalyptic number.

It is an amenable number.

143147021 is a deficient number, since it is larger than the sum of its proper divisors (8420431).

143147021 is an equidigital number, since it uses as much as digits as its factorization.

143147021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8420430.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 143147021 is about 11964.4064207131. The cubic root of 143147021 is about 523.1113039336. Note that the first 3 decimals are identical.

Adding to 143147021 its reverse (120741341), we get a palindrome (263888362).

The spelling of 143147021 in words is "one hundred forty-three million, one hundred forty-seven thousand, twenty-one".