140443021 has 4 divisors (see below), whose sum is σ = 142366972. Its totient is φ = 138519072.

The previous prime is 140443013. The next prime is 140443033. The reversal of 140443021 is 120344041.

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 47416996 + 93026025 = 6886^2 + 9645^2 .

It is a cyclic number.

It is not a de Polignac number, because 140443021 - 2³ = 140443013 is a prime.

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 140443021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140443091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961866 + ... + 962011.

It is an arithmetic number, because the mean of its divisors is an integer number (35591743).

Almost surely, 2^140443021 is an apocalyptic number.

It is an amenable number.

140443021 is a deficient number, since it is larger than the sum of its proper divisors (1923951).

140443021 is an equidigital number, since it uses as much as digits as its factorization.

140443021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1923950.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 140443021 is about 11850.8658333474. The cubic root of 140443021 is about 519.7965439265.

Adding to 140443021 its reverse (120344041), we get a palindrome (260787062).

The spelling of 140443021 in words is "one hundred forty million, four hundred forty-three thousand, twenty-one".