221115345 has 48 divisors (see below), whose sum is σ = 410073408. Its totient is φ = 100879360.

The previous prime is 221115341. The next prime is 221115437. The reversal of 221115345 is 543511122.

It is a happy number.

It is not a de Polignac number, because 221115345 - 2² = 221115341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221115341) 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 47 ways as a sum of consecutive naturals, for example, 45367 + ... + 50003.

It is an arithmetic number, because the mean of its divisors is an integer number (8543196).

Almost surely, 2^221115345 is an apocalyptic number.

It is an amenable number.

221115345 is a deficient number, since it is larger than the sum of its proper divisors (188958063).

221115345 is a wasteful number, since it uses less digits than its factorization.

221115345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4690 (or 4673 counting only the distinct ones).

The product of its digits is 1200, while the sum is 24.

The square root of 221115345 is about 14869.9477134252. The cubic root of 221115345 is about 604.6995252234.

Adding to 221115345 its reverse (543511122), we get a palindrome (764626467).

The spelling of 221115345 in words is "two hundred twenty-one million, one hundred fifteen thousand, three hundred forty-five".