221344013 has 16 divisors (see below), whose sum is σ = 244947456. Its totient is φ = 198341040.

The previous prime is 221344007. The next prime is 221344031. The reversal of 221344013 is 310443122.

It is a cyclic number.

It is not a de Polignac number, because 221344013 - 2⁶ = 221343949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221344043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 392870 + ... + 393432.

It is an arithmetic number, because the mean of its divisors is an integer number (15309216).

Almost surely, 2^221344013 is an apocalyptic number.

It is an amenable number.

221344013 is a deficient number, since it is larger than the sum of its proper divisors (23603443).

221344013 is a wasteful number, since it uses less digits than its factorization.

221344013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 221344013 is about 14877.6346574313. The cubic root of 221344013 is about 604.9079048397.

Adding to 221344013 its reverse (310443122), we get a palindrome (531787135).

The spelling of 221344013 in words is "two hundred twenty-one million, three hundred forty-four thousand, thirteen".