421401323204243 has 2 divisors, whose sum is σ = 421401323204244. Its totient is φ = 421401323204242.

The previous prime is 421401323204159. The next prime is 421401323204347. The reversal of 421401323204243 is 342402323104124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421401323204243 - 2¹² = 421401323200147 is a prime.

It is not a weakly prime, because it can be changed into another prime (421401323204443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210700661602121 + 210700661602122.

It is an arithmetic number, because the mean of its divisors is an integer number (210700661602122).

Almost surely, 2^{421401323204243} is an apocalyptic number.

421401323204243 is a deficient number, since it is larger than the sum of its proper divisors (1).

421401323204243 is an equidigital number, since it uses as much as digits as its factorization.

421401323204243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 35.

Adding to 421401323204243 its reverse (342402323104124), we get a palindrome (763803646308367).

The spelling of 421401323204243 in words is "four hundred twenty-one trillion, four hundred one billion, three hundred twenty-three million, two hundred four thousand, two hundred forty-three".