431242020221 has 6 divisors (see below), whose sum is σ = 437774539230. Its totient is φ = 424805567736.

The previous prime is 431242020161. The next prime is 431242020233. The reversal of 431242020221 is 122020242134.

It can be written as a sum of positive squares in only one way, i.e., 266498575225 + 164743444996 = 516235^2 + 405886^2 .

It is not a de Polignac number, because 431242020221 - 2¹⁴ = 431242003837 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 (431242023221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 48028706 + ... + 48037683.

It is an arithmetic number, because the mean of its divisors is an integer number (72962423205).

Almost surely, 2^431242020221 is an apocalyptic number.

It is an amenable number.

431242020221 is a deficient number, since it is larger than the sum of its proper divisors (6532519009).

431242020221 is an frugal number, since it uses more digits than its factorization.

431242020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96066523 (or 96066456 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 431242020221 its reverse (122020242134), we get a palindrome (553262262355).

The spelling of 431242020221 in words is "four hundred thirty-one billion, two hundred forty-two million, twenty thousand, two hundred twenty-one".