421643504629 has 2 divisors, whose sum is σ = 421643504630. Its totient is φ = 421643504628.

The previous prime is 421643504627. The next prime is 421643504641. The reversal of 421643504629 is 926405346124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 412896204900 + 8747299729 = 642570^2 + 93527^2 .

It is a cyclic number.

It is not a de Polignac number, because 421643504629 - 2¹ = 421643504627 is a prime.

Together with 421643504627, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421643504627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210821752314 + 210821752315.

It is an arithmetic number, because the mean of its divisors is an integer number (210821752315).

Almost surely, 2^421643504629 is an apocalyptic number.

It is an amenable number.

421643504629 is a deficient number, since it is larger than the sum of its proper divisors (1).

421643504629 is an equidigital number, since it uses as much as digits as its factorization.

421643504629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 421643504629 in words is "four hundred twenty-one billion, six hundred forty-three million, five hundred four thousand, six hundred twenty-nine".