431431222421 has 2 divisors, whose sum is σ = 431431222422. Its totient is φ = 431431222420.

The previous prime is 431431222403. The next prime is 431431222423. The reversal of 431431222421 is 124222134134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418414922500 + 13016299921 = 646850^2 + 114089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431431222421 is a prime.

It is a super-3 number, since 3×431431222421³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 431431222423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431431222423) 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 as a sum of consecutive naturals, namely, 215715611210 + 215715611211.

It is an arithmetic number, because the mean of its divisors is an integer number (215715611211).

Almost surely, 2^431431222421 is an apocalyptic number.

It is an amenable number.

431431222421 is a deficient number, since it is larger than the sum of its proper divisors (1).

431431222421 is an equidigital number, since it uses as much as digits as its factorization.

431431222421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 29.

Adding to 431431222421 its reverse (124222134134), we get a palindrome (555653356555).

The spelling of 431431222421 in words is "four hundred thirty-one billion, four hundred thirty-one million, two hundred twenty-two thousand, four hundred twenty-one".