203213221 has 4 divisors (see below), whose sum is σ = 203493472. Its totient is φ = 202932972.

The previous prime is 203213209. The next prime is 203213243. The reversal of 203213221 is 122312302.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 203213221 - 2¹⁷ = 203082149 is a prime.

It is a super-2 number, since 2×203213221² = 82591226378389682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203213195 and 203213204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203213251) 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 3 ways as a sum of consecutive naturals, for example, 139035 + ... + 140488.

It is an arithmetic number, because the mean of its divisors is an integer number (50873368).

Almost surely, 2^203213221 is an apocalyptic number.

It is an amenable number.

203213221 is a deficient number, since it is larger than the sum of its proper divisors (280251).

203213221 is an equidigital number, since it uses as much as digits as its factorization.

203213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280250.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 203213221 is about 14255.2874751792. The cubic root of 203213221 is about 587.9187620116.

Adding to 203213221 its reverse (122312302), we get a palindrome (325525523).

The spelling of 203213221 in words is "two hundred three million, two hundred thirteen thousand, two hundred twenty-one".