421123321243 has 2 divisors, whose sum is σ = 421123321244. Its totient is φ = 421123321242.

The previous prime is 421123321189. The next prime is 421123321303. The reversal of 421123321243 is 342123321124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421123321243 is a prime.

It is not a weakly prime, because it can be changed into another prime (421123321043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210561660621 + 210561660622.

It is an arithmetic number, because the mean of its divisors is an integer number (210561660622).

Almost surely, 2^421123321243 is an apocalyptic number.

421123321243 is a deficient number, since it is larger than the sum of its proper divisors (1).

421123321243 is an equidigital number, since it uses as much as digits as its factorization.

421123321243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 28.

Adding to 421123321243 its reverse (342123321124), we get a palindrome (763246642367).

The spelling of 421123321243 in words is "four hundred twenty-one billion, one hundred twenty-three million, three hundred twenty-one thousand, two hundred forty-three".