421603221 has 8 divisors (see below), whose sum is σ = 605379040. Its totient is φ = 259448112.

The previous prime is 421603211. The next prime is 421603253. The reversal of 421603221 is 122306124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421603221 - 2⁶ = 421603157 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 (421603201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5405131 + ... + 5405208.

It is an arithmetic number, because the mean of its divisors is an integer number (75672380).

Almost surely, 2^421603221 is an apocalyptic number.

It is an amenable number.

421603221 is a deficient number, since it is larger than the sum of its proper divisors (183775819).

421603221 is a wasteful number, since it uses less digits than its factorization.

421603221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10810355.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 421603221 is about 20532.9788632824. The cubic root of 421603221 is about 749.8389111808.

Adding to 421603221 its reverse (122306124), we get a palindrome (543909345).

The spelling of 421603221 in words is "four hundred twenty-one million, six hundred three thousand, two hundred twenty-one".