421201204424 has 128 divisors (see below), whose sum is σ = 1062590054400. Its totient is φ = 151163331840.

The previous prime is 421201204393. The next prime is 421201204441. The reversal of 421201204424 is 424402102124.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a junction number, because it is equal to n+sod(n) for n = 421201204393 and 421201204402.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3780929 + ... + 3890735.

It is an arithmetic number, because the mean of its divisors is an integer number (8301484800).

Almost surely, 2^421201204424 is an apocalyptic number.

421201204424 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421201204424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (531295027200).

421201204424 is an abundant number, since it is smaller than the sum of its proper divisors (641388849976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421201204424 is a wasteful number, since it uses less digits than its factorization.

421201204424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110323 (or 110319 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 421201204424 its reverse (424402102124), we get a palindrome (845603306548).

The spelling of 421201204424 in words is "four hundred twenty-one billion, two hundred one million, two hundred four thousand, four hundred twenty-four".