420444421 has 4 divisors (see below), whose sum is σ = 420495712. Its totient is φ = 420393132.

The previous prime is 420444419. The next prime is 420444433. The reversal of 420444421 is 124444024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 420444421 - 2¹ = 420444419 is a prime.

It is a super-2 number, since 2×420444421² = 353547022300050482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420444491) 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, 10281 + ... + 30766.

It is an arithmetic number, because the mean of its divisors is an integer number (105123928).

Almost surely, 2^420444421 is an apocalyptic number.

It is an amenable number.

420444421 is a deficient number, since it is larger than the sum of its proper divisors (51291).

420444421 is a wasteful number, since it uses less digits than its factorization.

420444421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51290.

The product of its (nonzero) digits is 4096, while the sum is 25.

The square root of 420444421 is about 20504.7414272894. The cubic root of 420444421 is about 749.1512894309.

Adding to 420444421 its reverse (124444024), we get a palindrome (544888445).

The spelling of 420444421 in words is "four hundred twenty million, four hundred forty-four thousand, four hundred twenty-one".