421717399021 has 8 divisors (see below), whose sum is σ = 433689984864. Its totient is φ = 409893541200.

The previous prime is 421717399009. The next prime is 421717399057. The reversal of 421717399021 is 120993717124.

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

It is not a de Polignac number, because 421717399021 - 2¹¹ = 421717396973 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 (421717319021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37176255 + ... + 37187596.

It is an arithmetic number, because the mean of its divisors is an integer number (54211248108).

Almost surely, 2^421717399021 is an apocalyptic number.

It is an amenable number.

421717399021 is a deficient number, since it is larger than the sum of its proper divisors (11972585843).

421717399021 is a wasteful number, since it uses less digits than its factorization.

421717399021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74364011.

The product of its (nonzero) digits is 190512, while the sum is 46.

The spelling of 421717399021 in words is "four hundred twenty-one billion, seven hundred seventeen million, three hundred ninety-nine thousand, twenty-one".