421834748581 has 4 divisors (see below), whose sum is σ = 421954150572. Its totient is φ = 421715346592.

The previous prime is 421834748561. The next prime is 421834748603. The reversal of 421834748581 is 185847438124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 147713392225 + 274121356356 = 384335^2 + 523566^2 .

It is a cyclic number.

It is not a de Polignac number, because 421834748581 - 2⁷ = 421834748453 is a prime.

It is a super-3 number, since 3×421834748581³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421834748561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59695696 + ... + 59702761.

It is an arithmetic number, because the mean of its divisors is an integer number (105488537643).

Almost surely, 2^421834748581 is an apocalyptic number.

It is an amenable number.

421834748581 is a deficient number, since it is larger than the sum of its proper divisors (119401991).

421834748581 is a wasteful number, since it uses less digits than its factorization.

421834748581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119401990.

The product of its digits is 6881280, while the sum is 55.

The spelling of 421834748581 in words is "four hundred twenty-one billion, eight hundred thirty-four million, seven hundred forty-eight thousand, five hundred eighty-one".