221334413 has 16 divisors (see below), whose sum is σ = 230985216. Its totient is φ = 211947840.

The previous prime is 221334403. The next prime is 221334431. The reversal of 221334413 is 314433122.

221334413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 221334413 - 2¹⁰ = 221333389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221334403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 720806 + ... + 721112.

It is an arithmetic number, because the mean of its divisors is an integer number (14436576).

Almost surely, 2^221334413 is an apocalyptic number.

It is an amenable number.

221334413 is a deficient number, since it is larger than the sum of its proper divisors (9650803).

221334413 is a wasteful number, since it uses less digits than its factorization.

221334413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644.

The product of its digits is 1728, while the sum is 23.

The square root of 221334413 is about 14877.3120220018. The cubic root of 221334413 is about 604.8991594788.

Adding to 221334413 its reverse (314433122), we get a palindrome (535767535).

The spelling of 221334413 in words is "two hundred twenty-one million, three hundred thirty-four thousand, four hundred thirteen".