421343343121 has 2 divisors, whose sum is σ = 421343343122. Its totient is φ = 421343343120.

The previous prime is 421343343119. The next prime is 421343343137. The reversal of 421343343121 is 121343343124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 281982240400 + 139361102721 = 531020^2 + 373311^2 .

It is a cyclic number.

It is not a de Polignac number, because 421343343121 - 2¹ = 421343343119 is a prime.

Together with 421343343119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (421343343191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210671671560 + 210671671561.

It is an arithmetic number, because the mean of its divisors is an integer number (210671671561).

Almost surely, 2^421343343121 is an apocalyptic number.

It is an amenable number.

421343343121 is a deficient number, since it is larger than the sum of its proper divisors (1).

421343343121 is an equidigital number, since it uses as much as digits as its factorization.

421343343121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 31.

Adding to 421343343121 its reverse (121343343124), we get a palindrome (542686686245).

The spelling of 421343343121 in words is "four hundred twenty-one billion, three hundred forty-three million, three hundred forty-three thousand, one hundred twenty-one".