421675621 has 4 divisors (see below), whose sum is σ = 424262752. Its totient is φ = 419088492.

The previous prime is 421675613. The next prime is 421675637. The reversal of 421675621 is 126576124.

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.

It is a cyclic number.

It is not a de Polignac number, because 421675621 - 2³ = 421675613 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 (421675601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1293321 + ... + 1293646.

It is an arithmetic number, because the mean of its divisors is an integer number (106065688).

Almost surely, 2^421675621 is an apocalyptic number.

It is an amenable number.

421675621 is a deficient number, since it is larger than the sum of its proper divisors (2587131).

421675621 is a wasteful number, since it uses less digits than its factorization.

421675621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2587130.

The product of its digits is 20160, while the sum is 34.

The square root of 421675621 is about 20534.7418050483. The cubic root of 421675621 is about 749.8818308639.

The spelling of 421675621 in words is "four hundred twenty-one million, six hundred seventy-five thousand, six hundred twenty-one".