221911745 has 8 divisors (see below), whose sum is σ = 290502720. Its totient is φ = 161390320.

The previous prime is 221911709. The next prime is 221911747. The reversal of 221911745 is 547119122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-221911745 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221911747) 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 7 ways as a sum of consecutive naturals, for example, 2017325 + ... + 2017434.

It is an arithmetic number, because the mean of its divisors is an integer number (36312840).

Almost surely, 2^221911745 is an apocalyptic number.

It is an amenable number.

221911745 is a deficient number, since it is larger than the sum of its proper divisors (68590975).

221911745 is a wasteful number, since it uses less digits than its factorization.

221911745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4034775.

The product of its digits is 5040, while the sum is 32.

The square root of 221911745 is about 14896.7024874635. The cubic root of 221911745 is about 605.4246455258.

The spelling of 221911745 in words is "two hundred twenty-one million, nine hundred eleven thousand, seven hundred forty-five".