431220405221 has 4 divisors (see below), whose sum is σ = 431221726572. Its totient is φ = 431219083872.

The previous prime is 431220405191. The next prime is 431220405269. The reversal of 431220405221 is 122504022134.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 162259924225 + 268960480996 = 402815^2 + 518614^2 .

It is a cyclic number.

It is not a de Polignac number, because 431220405221 - 2⁶ = 431220405157 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 (431220405271) 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, 221435 + ... + 954711.

It is an arithmetic number, because the mean of its divisors is an integer number (107805431643).

Almost surely, 2^431220405221 is an apocalyptic number.

It is an amenable number.

431220405221 is a deficient number, since it is larger than the sum of its proper divisors (1321351).

431220405221 is an equidigital number, since it uses as much as digits as its factorization.

431220405221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321350.

The product of its (nonzero) digits is 3840, while the sum is 26.

Adding to 431220405221 its reverse (122504022134), we get a palindrome (553724427355).

The spelling of 431220405221 in words is "four hundred thirty-one billion, two hundred twenty million, four hundred five thousand, two hundred twenty-one".