421504876543 has 2 divisors, whose sum is σ = 421504876544. Its totient is φ = 421504876542.

The previous prime is 421504876537. The next prime is 421504876577. The reversal of 421504876543 is 345678405124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421504876543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421504876043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210752438271 + 210752438272.

It is an arithmetic number, because the mean of its divisors is an integer number (210752438272).

Almost surely, 2^421504876543 is an apocalyptic number.

421504876543 is a deficient number, since it is larger than the sum of its proper divisors (1).

421504876543 is an equidigital number, since it uses as much as digits as its factorization.

421504876543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3225600, while the sum is 49.

The spelling of 421504876543 in words is "four hundred twenty-one billion, five hundred four million, eight hundred seventy-six thousand, five hundred forty-three".