221113645 has 8 divisors (see below), whose sum is σ = 280944504. Its totient is φ = 166485504.

The previous prime is 221113631. The next prime is 221113649. The reversal of 221113645 is 546311122.

It is a happy number.

221113645 is nontrivially palindromic in base 16.

It can be written as a sum of positive squares in 4 ways, for example, as 11269449 + 209844196 = 3357^2 + 14486^2 .

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 221113645 - 2⁹ = 221113133 is a prime.

It is a super-3 number, since 3×221113645³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221113649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1300584 + ... + 1300753.

It is an arithmetic number, because the mean of its divisors is an integer number (35118063).

Almost surely, 2^221113645 is an apocalyptic number.

It is an amenable number.

221113645 is a deficient number, since it is larger than the sum of its proper divisors (59830859).

221113645 is a wasteful number, since it uses less digits than its factorization.

221113645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2601359.

The product of its digits is 1440, while the sum is 25.

The square root of 221113645 is about 14869.8905510431. The cubic root of 221113645 is about 604.6979755167.

Adding to 221113645 its reverse (546311122), we get a palindrome (767424767).

The spelling of 221113645 in words is "two hundred twenty-one million, one hundred thirteen thousand, six hundred forty-five".