221313266 has 8 divisors (see below), whose sum is σ = 338233644. Its totient is φ = 108568720.

The previous prime is 221313263. The next prime is 221313269. The reversal of 221313266 is 662313122.

It is an interprime number because it is at equal distance from previous prime (221313263) and next prime (221313269).

It can be written as a sum of positive squares in 2 ways, for example, as 219662041 + 1651225 = 14821^2 + 1285^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221313263) 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, 1043825 + ... + 1044036.

Almost surely, 2^221313266 is an apocalyptic number.

221313266 is a deficient number, since it is larger than the sum of its proper divisors (116920378).

221313266 is a wasteful number, since it uses less digits than its factorization.

221313266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2087916.

The product of its digits is 2592, while the sum is 26.

The square root of 221313266 is about 14876.6012919618. The cubic root of 221313266 is about 604.8798941963.

Adding to 221313266 its reverse (662313122), we get a palindrome (883626388).

It can be divided in two parts, 22131326 and 6, that multiplied together give a triangular number (132787956 = T₁₆₂₉₆).

The spelling of 221313266 in words is "two hundred twenty-one million, three hundred thirteen thousand, two hundred sixty-six".