221203313 has 4 divisors (see below), whose sum is σ = 221377008. Its totient is φ = 221029620.

The previous prime is 221203253. The next prime is 221203361. The reversal of 221203313 is 313302122.

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 221203313 - 2⁶ = 221203249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221203291 and 221203300.

It is not an unprimeable number, because it can be changed into a prime (221203363) 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, 84923 + ... + 87488.

It is an arithmetic number, because the mean of its divisors is an integer number (55344252).

Almost surely, 2^221203313 is an apocalyptic number.

It is an amenable number.

221203313 is a deficient number, since it is larger than the sum of its proper divisors (173695).

221203313 is a wasteful number, since it uses less digits than its factorization.

221203313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173694.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 221203313 is about 14872.9053315080. The cubic root of 221203313 is about 604.7797053291.

Adding to 221203313 its reverse (313302122), we get a palindrome (534505435).

The spelling of 221203313 in words is "two hundred twenty-one million, two hundred three thousand, three hundred thirteen".