421601 has 4 divisors (see below), whose sum is σ = 424212. Its totient is φ = 418992.

The previous prime is 421559. The next prime is 421607. The reversal of 421601 is 106124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 390625 + 30976 = 625^2 + 176^2 .

It is a cyclic number.

It is not a de Polignac number, because 421601 - 2¹⁸ = 159457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421607) 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, 1046 + ... + 1391.

It is an arithmetic number, because the mean of its divisors is an integer number (106053).

2⁴²¹⁶⁰¹ is an apocalyptic number.

It is an amenable number.

421601 is a deficient number, since it is larger than the sum of its proper divisors (2611).

421601 is a wasteful number, since it uses less digits than its factorization.

421601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2610.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 421601 is about 649.3080932808. The cubic root of 421601 is about 74.9837594465.

Adding to 421601 its reverse (106124), we get a palindrome (527725).

The spelling of 421601 in words is "four hundred twenty-one thousand, six hundred one".