431243503421 has 4 divisors (see below), whose sum is σ = 431315611644. Its totient is φ = 431171395200.

The previous prime is 431243503409. The next prime is 431243503423. The reversal of 431243503421 is 124305342134.

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 135074625625 + 296168877796 = 367525^2 + 544214^2 .

It is a cyclic number.

It is not a de Polignac number, because 431243503421 - 2¹⁰ = 431243502397 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 (431243503423) 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, 36045140 + ... + 36057101.

It is an arithmetic number, because the mean of its divisors is an integer number (107828902911).

Almost surely, 2^431243503421 is an apocalyptic number.

It is an amenable number.

431243503421 is a deficient number, since it is larger than the sum of its proper divisors (72108223).

431243503421 is an equidigital number, since it uses as much as digits as its factorization.

431243503421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72108222.

The product of its (nonzero) digits is 34560, while the sum is 32.

Adding to 431243503421 its reverse (124305342134), we get a palindrome (555548845555).

The spelling of 431243503421 in words is "four hundred thirty-one billion, two hundred forty-three million, five hundred three thousand, four hundred twenty-one".