221644313 has 8 divisors (see below), whose sum is σ = 243193536. Its totient is φ = 200328400.

The previous prime is 221644309. The next prime is 221644333. The reversal of 221644313 is 313446122.

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 221644313 - 2² = 221644309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221644333) 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, 56333 + ... + 60138.

It is an arithmetic number, because the mean of its divisors is an integer number (30399192).

Almost surely, 2^221644313 is an apocalyptic number.

It is an amenable number.

221644313 is a deficient number, since it is larger than the sum of its proper divisors (21549223).

221644313 is a wasteful number, since it uses less digits than its factorization.

221644313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116655.

The product of its digits is 3456, while the sum is 26.

The square root of 221644313 is about 14887.7235667512. The cubic root of 221644313 is about 605.1813430842.

The spelling of 221644313 in words is "two hundred twenty-one million, six hundred forty-four thousand, three hundred thirteen".