221245203445 has 16 divisors (see below), whose sum is σ = 304575701760. Its totient is φ = 151134142464.

The previous prime is 221245203419. The next prime is 221245203449. The reversal of 221245203445 is 544302542122.

It is a cyclic number.

It is not a de Polignac number, because 221245203445 - 2⁹ = 221245202933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221245203445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221245203449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12008460 + ... + 12026869.

It is an arithmetic number, because the mean of its divisors is an integer number (19035981360).

Almost surely, 2^221245203445 is an apocalyptic number.

It is an amenable number.

221245203445 is a deficient number, since it is larger than the sum of its proper divisors (83330498315).

221245203445 is a wasteful number, since it uses less digits than its factorization.

221245203445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24035604.

The product of its (nonzero) digits is 76800, while the sum is 34.

Adding to 221245203445 its reverse (544302542122), we get a palindrome (765547745567).

The spelling of 221245203445 in words is "two hundred twenty-one billion, two hundred forty-five million, two hundred three thousand, four hundred forty-five".