421834764979 has 2 divisors, whose sum is σ = 421834764980. Its totient is φ = 421834764978.

The previous prime is 421834764943. The next prime is 421834765013. The reversal of 421834764979 is 979467438124.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421834764979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421834764979.

It is not a weakly prime, because it can be changed into another prime (421834764479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210917382489 + 210917382490.

It is an arithmetic number, because the mean of its divisors is an integer number (210917382490).

Almost surely, 2^421834764979 is an apocalyptic number.

421834764979 is a deficient number, since it is larger than the sum of its proper divisors (1).

421834764979 is an equidigital number, since it uses as much as digits as its factorization.

421834764979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73156608, while the sum is 64.

The spelling of 421834764979 in words is "four hundred twenty-one billion, eight hundred thirty-four million, seven hundred sixty-four thousand, nine hundred seventy-nine".