143321421 has 4 divisors (see below), whose sum is σ = 191095232. Its totient is φ = 95547612.

The previous prime is 143321341. The next prime is 143321429. The reversal of 143321421 is 124123341.

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.

It is not a de Polignac number, because 143321421 - 2⁷ = 143321293 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 (143321429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23886901 + ... + 23886906.

It is an arithmetic number, because the mean of its divisors is an integer number (47773808).

Almost surely, 2^143321421 is an apocalyptic number.

It is an amenable number.

143321421 is a deficient number, since it is larger than the sum of its proper divisors (47773811).

143321421 is an equidigital number, since it uses as much as digits as its factorization.

143321421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47773810.

The product of its digits is 576, while the sum is 21.

The square root of 143321421 is about 11971.6924868625. The cubic root of 143321421 is about 523.3236580719.

Adding to 143321421 its reverse (124123341), we get a palindrome (267444762).

It can be divided in two parts, 14332 and 1421, that added together give a triangular number (15753 = T₁₇₇).

The spelling of 143321421 in words is "one hundred forty-three million, three hundred twenty-one thousand, four hundred twenty-one".