421643504627 has 2 divisors, whose sum is σ = 421643504628. Its totient is φ = 421643504626.

The previous prime is 421643504599. The next prime is 421643504629. The reversal of 421643504627 is 726405346124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421643504627 - 2²⁰ = 421642456051 is a prime.

Together with 421643504629, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421643504629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210821752313 + 210821752314.

It is an arithmetic number, because the mean of its divisors is an integer number (210821752314).

Almost surely, 2^421643504627 is an apocalyptic number.

421643504627 is a deficient number, since it is larger than the sum of its proper divisors (1).

421643504627 is an equidigital number, since it uses as much as digits as its factorization.

421643504627 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 967680, while the sum is 44.

The spelling of 421643504627 in words is "four hundred twenty-one billion, six hundred forty-three million, five hundred four thousand, six hundred twenty-seven".