143206421 has 4 divisors (see below), whose sum is σ = 144085152. Its totient is φ = 142327692.

The previous prime is 143206417. The next prime is 143206471. The reversal of 143206421 is 124602341.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124602341 = 2857 ⋅43613.

It is a cyclic number.

It is not a de Polignac number, because 143206421 - 2² = 143206417 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 (143206411) 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, 439121 + ... + 439446.

It is an arithmetic number, because the mean of its divisors is an integer number (36021288).

Almost surely, 2^143206421 is an apocalyptic number.

It is an amenable number.

143206421 is a deficient number, since it is larger than the sum of its proper divisors (878731).

143206421 is an equidigital number, since it uses as much as digits as its factorization.

143206421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 878730.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 143206421 is about 11966.8885262628. Note that the first 3 decimals coincide. The cubic root of 143206421 is about 523.1836503326.

Adding to 143206421 its reverse (124602341), we get a palindrome (267808762).

The spelling of 143206421 in words is "one hundred forty-three million, two hundred six thousand, four hundred twenty-one".