221033345 has 16 divisors (see below), whose sum is σ = 285978000. Its totient is φ = 163033344.

The previous prime is 221033341. The next prime is 221033357. The reversal of 221033345 is 543330122.

It can be written as a sum of positive squares in 8 ways, for example, as 25816561 + 195216784 = 5081^2 + 13972^2 .

It is a cyclic number.

It is not a de Polignac number, because 221033345 - 2² = 221033341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221033345.

It is not an unprimeable number, because it can be changed into a prime (221033341) 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, 79031 + ... + 81779.

It is an arithmetic number, because the mean of its divisors is an integer number (17873625).

Almost surely, 2^221033345 is an apocalyptic number.

It is an amenable number.

221033345 is a deficient number, since it is larger than the sum of its proper divisors (64944655).

221033345 is a wasteful number, since it uses less digits than its factorization.

221033345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004.

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 221033345 is about 14867.1902187333. The cubic root of 221033345 is about 604.6247656119.

Adding to 221033345 its reverse (543330122), we get a palindrome (764363467).

The spelling of 221033345 in words is "two hundred twenty-one million, thirty-three thousand, three hundred forty-five".