143221421 has 8 divisors (see below), whose sum is σ = 163782720. Its totient is φ = 122685408.

The previous prime is 143221369. The next prime is 143221451. The reversal of 143221421 is 124122341.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 143221421 - 2⁶ = 143221357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 143221393 and 143221402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143221451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7985 + ... + 18713.

It is an arithmetic number, because the mean of its divisors is an integer number (20472840).

Almost surely, 2^143221421 is an apocalyptic number.

It is an amenable number.

143221421 is a deficient number, since it is larger than the sum of its proper divisors (20561299).

143221421 is a wasteful number, since it uses less digits than its factorization.

143221421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12643.

The product of its digits is 384, while the sum is 20.

The square root of 143221421 is about 11967.5152391798. The cubic root of 143221421 is about 523.2019164613.

Adding to 143221421 its reverse (124122341), we get a palindrome (267343762).

The spelling of 143221421 in words is "one hundred forty-three million, two hundred twenty-one thousand, four hundred twenty-one".