221203201 has 6 divisors (see below), whose sum is σ = 234980870. Its totient is φ = 208190976.

The previous prime is 221203193. The next prime is 221203219. The reversal of 221203201 is 102302122.

It can be written as a sum of positive squares in 3 ways, for example, as 46566976 + 174636225 = 6824^2 + 13215^2 .

It is not a de Polignac number, because 221203201 - 2³ = 221203193 is a prime.

It is a super-2 number, since 2×221203201² = 97861712265292802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221203601) 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 5 ways as a sum of consecutive naturals, for example, 382416 + ... + 382993.

Almost surely, 2^221203201 is an apocalyptic number.

It is an amenable number.

221203201 is a deficient number, since it is larger than the sum of its proper divisors (13777669).

221203201 is an equidigital number, since it uses as much as digits as its factorization.

221203201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765443 (or 765426 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 221203201 is about 14872.9015662715. The cubic root of 221203201 is about 604.7796032580.

Adding to 221203201 its reverse (102302122), we get a palindrome (323505323).

The spelling of 221203201 in words is "two hundred twenty-one million, two hundred three thousand, two hundred one".