221331313 has 8 divisors (see below), whose sum is σ = 267829632. Its totient is φ = 178552896.

The previous prime is 221331293. The next prime is 221331337. The reversal of 221331313 is 313133122.

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

It is a cyclic number.

It is not a de Polignac number, because 221331313 - 2⁵ = 221331281 is a prime.

It is a super-2 number, since 2×221331313² = 97975100228607938, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221331013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 929845 + ... + 930082.

It is an arithmetic number, because the mean of its divisors is an integer number (33478704).

Almost surely, 2^221331313 is an apocalyptic number.

It is an amenable number.

221331313 is a deficient number, since it is larger than the sum of its proper divisors (46498319).

221331313 is a wasteful number, since it uses less digits than its factorization.

221331313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1859951.

The product of its digits is 324, while the sum is 19.

The square root of 221331313 is about 14877.2078361499. The cubic root of 221331313 is about 604.8963354019.

Adding to 221331313 its reverse (313133122), we get a palindrome (534464435).

The spelling of 221331313 in words is "two hundred twenty-one million, three hundred thirty-one thousand, three hundred thirteen".