221644013 has 8 divisors (see below), whose sum is σ = 229495680. Its totient is φ = 213806320.

The previous prime is 221644001. The next prime is 221644019. The reversal of 221644013 is 310446122.

221644013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 221644013 - 2⁴ = 221643997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221644013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221644019) 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, 36848 + ... + 42438.

It is an arithmetic number, because the mean of its divisors is an integer number (28686960).

Almost surely, 2^221644013 is an apocalyptic number.

It is an amenable number.

221644013 is a deficient number, since it is larger than the sum of its proper divisors (7851667).

221644013 is a wasteful number, since it uses less digits than its factorization.

221644013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6987.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 221644013 is about 14887.7134913324. The cubic root of 221644013 is about 605.1810700424.

The spelling of 221644013 in words is "two hundred twenty-one million, six hundred forty-four thousand, thirteen".