203313311221 has 4 divisors (see below), whose sum is σ = 204047294572. Its totient is φ = 202579327872.

The previous prime is 203313311189. The next prime is 203313311233. The reversal of 203313311221 is 122113313302.

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 135913882225 + 67399428996 = 368665^2 + 259614^2 .

It is a cyclic number.

It is not a de Polignac number, because 203313311221 - 2⁵ = 203313311189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203313311192 and 203313311201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203313311021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366991260 + ... + 366991813.

It is an arithmetic number, because the mean of its divisors is an integer number (51011823643).

Almost surely, 2^203313311221 is an apocalyptic number.

It is an amenable number.

203313311221 is a deficient number, since it is larger than the sum of its proper divisors (733983351).

203313311221 is an equidigital number, since it uses as much as digits as its factorization.

203313311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733983350.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 203313311221 its reverse (122113313302), we get a palindrome (325426624523).

The spelling of 203313311221 in words is "two hundred three billion, three hundred thirteen million, three hundred eleven thousand, two hundred twenty-one".