421404421 has 8 divisors (see below), whose sum is σ = 439308288. Its totient is φ = 403770000.

The previous prime is 421404419. The next prime is 421404427. The reversal of 421404421 is 124404124.

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 421404421 - 2¹ = 421404419 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421404392 and 421404401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421404427) 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, 64165 + ... + 70426.

It is an arithmetic number, because the mean of its divisors is an integer number (54913536).

Almost surely, 2^421404421 is an apocalyptic number.

It is an amenable number.

421404421 is a deficient number, since it is larger than the sum of its proper divisors (17903867).

421404421 is a wasteful number, since it uses less digits than its factorization.

421404421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134723.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 421404421 is about 20528.1372998136. The cubic root of 421404421 is about 749.7210346210.

Adding to 421404421 its reverse (124404124), we get a palindrome (545808545).

The spelling of 421404421 in words is "four hundred twenty-one million, four hundred four thousand, four hundred twenty-one".