421001 has 8 divisors (see below), whose sum is σ = 485760. Its totient is φ = 357408.

The previous prime is 420997. The next prime is 421009. The reversal of 421001 is 100124.

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 421001 - 2² = 420997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 421001.

It is not an unprimeable number, because it can be changed into a prime (421009) 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, 740 + ... + 1178.

It is an arithmetic number, because the mean of its divisors is an integer number (60720).

2⁴²¹⁰⁰¹ is an apocalyptic number.

It is an amenable number.

421001 is a deficient number, since it is larger than the sum of its proper divisors (64759).

421001 is a wasteful number, since it uses less digits than its factorization.

421001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 421001 is about 648.8458984998. The cubic root of 421001 is about 74.9481715999.

Adding to 421001 its reverse (100124), we get a palindrome (521125).

The spelling of 421001 in words is "four hundred twenty-one thousand, one", and thus it is an iban number.