421423324121 has 2 divisors, whose sum is σ = 421423324122. Its totient is φ = 421423324120.

The previous prime is 421423324111. The next prime is 421423324141. The reversal of 421423324121 is 121423324124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 408736455625 + 12686868496 = 639325^2 + 112636^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421423324121 is a prime.

It is a super-2 number, since 2×421423324121² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (421423324111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210711662060 + 210711662061.

It is an arithmetic number, because the mean of its divisors is an integer number (210711662061).

Almost surely, 2^421423324121 is an apocalyptic number.

It is an amenable number.

421423324121 is a deficient number, since it is larger than the sum of its proper divisors (1).

421423324121 is an equidigital number, since it uses as much as digits as its factorization.

421423324121 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 421423324121 its reverse (121423324124), we get a palindrome (542846648245).

The spelling of 421423324121 in words is "four hundred twenty-one billion, four hundred twenty-three million, three hundred twenty-four thousand, one hundred twenty-one".