143235231421 has 4 divisors (see below), whose sum is σ = 143962314012. Its totient is φ = 142508148832.

The previous prime is 143235231409. The next prime is 143235231431. The reversal of 143235231421 is 124132532341.

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 74873376900 + 68361854521 = 273630^2 + 261461^2 .

It is a cyclic number.

It is not a de Polignac number, because 143235231421 - 2¹¹ = 143235229373 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 (143235231431) 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, 363541000 + ... + 363541393.

It is an arithmetic number, because the mean of its divisors is an integer number (35990578503).

Almost surely, 2^143235231421 is an apocalyptic number.

It is an amenable number.

143235231421 is a deficient number, since it is larger than the sum of its proper divisors (727082591).

143235231421 is an equidigital number, since it uses as much as digits as its factorization.

143235231421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727082590.

The product of its digits is 17280, while the sum is 31.

Adding to 143235231421 its reverse (124132532341), we get a palindrome (267367763762).

The spelling of 143235231421 in words is "one hundred forty-three billion, two hundred thirty-five million, two hundred thirty-one thousand, four hundred twenty-one".