431312522021 has 4 divisors (see below), whose sum is σ = 431324129772. Its totient is φ = 431300914272.

The previous prime is 431312521999. The next prime is 431312522033. The reversal of 431312522021 is 120225213134.

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 111085557025 + 320226964996 = 333295^2 + 565886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431312522021 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 (431312522321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5747960 + ... + 5822513.

It is an arithmetic number, because the mean of its divisors is an integer number (107831032443).

Almost surely, 2^431312522021 is an apocalyptic number.

It is an amenable number.

431312522021 is a deficient number, since it is larger than the sum of its proper divisors (11607751).

431312522021 is a wasteful number, since it uses less digits than its factorization.

431312522021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11607750.

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 431312522021 its reverse (120225213134), we get a palindrome (551537735155).

The spelling of 431312522021 in words is "four hundred thirty-one billion, three hundred twelve million, five hundred twenty-two thousand, twenty-one".