421641740543 has 2 divisors, whose sum is σ = 421641740544. Its totient is φ = 421641740542.

The previous prime is 421641740519. The next prime is 421641740549. The reversal of 421641740543 is 345047146124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421641740543 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421641740543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421641740549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210820870271 + 210820870272.

It is an arithmetic number, because the mean of its divisors is an integer number (210820870272).

Almost surely, 2^421641740543 is an apocalyptic number.

421641740543 is a deficient number, since it is larger than the sum of its proper divisors (1).

421641740543 is an equidigital number, since it uses as much as digits as its factorization.

421641740543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 322560, while the sum is 41.

Adding to 421641740543 its reverse (345047146124), we get a palindrome (766688886667).

The spelling of 421641740543 in words is "four hundred twenty-one billion, six hundred forty-one million, seven hundred forty thousand, five hundred forty-three".