421404423 has 16 divisors (see below), whose sum is σ = 634089600. Its totient is φ = 246589280.

The previous prime is 421404419. The next prime is 421404427. The reversal of 421404423 is 324404124.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (421404419) and next prime (421404427).

It is a cyclic number.

It is not a de Polignac number, because 421404423 - 2² = 421404419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421404393 and 421404402.

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 15 ways as a sum of consecutive naturals, for example, 219213 + ... + 221126.

It is an arithmetic number, because the mean of its divisors is an integer number (39630600).

Almost surely, 2^421404423 is an apocalyptic number.

421404423 is a deficient number, since it is larger than the sum of its proper divisors (212685177).

421404423 is a wasteful number, since it uses less digits than its factorization.

421404423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440382.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 421404423 is about 20528.1373485273. The cubic root of 421404423 is about 749.7210358071.

Adding to 421404423 its reverse (324404124), we get a palindrome (745808547).

The spelling of 421404423 in words is "four hundred twenty-one million, four hundred four thousand, four hundred twenty-three".