421724821823 has 8 divisors (see below), whose sum is σ = 424979064720. Its totient is φ = 418483072000.

The previous prime is 421724821787. The next prime is 421724821829. The reversal of 421724821823 is 328128427124.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421724821823 - 2¹² = 421724817727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421724821829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3055490 + ... + 3190527.

It is an arithmetic number, because the mean of its divisors is an integer number (53122383090).

Almost surely, 2^421724821823 is an apocalyptic number.

421724821823 is a deficient number, since it is larger than the sum of its proper divisors (3254242897).

421724821823 is a wasteful number, since it uses less digits than its factorization.

421724821823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6246537.

The product of its digits is 344064, while the sum is 44.

The spelling of 421724821823 in words is "four hundred twenty-one billion, seven hundred twenty-four million, eight hundred twenty-one thousand, eight hundred twenty-three".