421175621 has 8 divisors (see below), whose sum is σ = 427586688. Its totient is φ = 414778000.

The previous prime is 421175567. The next prime is 421175633. The reversal of 421175621 is 126571124.

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 421175621 - 2¹⁸ = 420913477 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 (421175681) 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, 72536 + ... + 78126.

It is an arithmetic number, because the mean of its divisors is an integer number (53448336).

Almost surely, 2^421175621 is an apocalyptic number.

It is an amenable number.

421175621 is a deficient number, since it is larger than the sum of its proper divisors (6411067).

421175621 is a wasteful number, since it uses less digits than its factorization.

421175621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6723.

The product of its digits is 3360, while the sum is 29.

The square root of 421175621 is about 20522.5637043718. The cubic root of 421175621 is about 749.5853239525.

The spelling of 421175621 in words is "four hundred twenty-one million, one hundred seventy-five thousand, six hundred twenty-one".