143404021 has 4 divisors (see below), whose sum is σ = 143449452. Its totient is φ = 143358592.

The previous prime is 143403991. The next prime is 143404067. The reversal of 143404021 is 120404341.

143404021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120404341 = 31 ⋅3884011.

It can be written as a sum of positive squares in 2 ways, for example, as 80820100 + 62583921 = 8990^2 + 7911^2 .

It is a cyclic number.

It is not a de Polignac number, because 143404021 - 2¹⁵ = 143371253 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 143404021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143404091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17596 + ... + 24421.

It is an arithmetic number, because the mean of its divisors is an integer number (35862363).

Almost surely, 2^143404021 is an apocalyptic number.

It is an amenable number.

143404021 is a deficient number, since it is larger than the sum of its proper divisors (45431).

143404021 is an equidigital number, since it uses as much as digits as its factorization.

143404021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45430.

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

The square root of 143404021 is about 11975.1417945676. The cubic root of 143404021 is about 523.4241739434.

Adding to 143404021 its reverse (120404341), we get a palindrome (263808362).

The spelling of 143404021 in words is "one hundred forty-three million, four hundred four thousand, twenty-one".