221013313 has 4 divisors (see below), whose sum is σ = 223676208. Its totient is φ = 218350420.

The previous prime is 221013283. The next prime is 221013319. The reversal of 221013313 is 313310122.

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 221013313 - 2¹³ = 221005121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221013319) 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, 1331323 + ... + 1331488.

It is an arithmetic number, because the mean of its divisors is an integer number (55919052).

Almost surely, 2^221013313 is an apocalyptic number.

It is an amenable number.

221013313 is a deficient number, since it is larger than the sum of its proper divisors (2662895).

221013313 is an equidigital number, since it uses as much as digits as its factorization.

221013313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662894.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 221013313 is about 14866.5165052207. The cubic root of 221013313 is about 604.6064995757.

Adding to 221013313 its reverse (313310122), we get a palindrome (534323435).

The spelling of 221013313 in words is "two hundred twenty-one million, thirteen thousand, three hundred thirteen".