221322045 has 32 divisors (see below), whose sum is σ = 405377280. Its totient is φ = 101007360.

The previous prime is 221322037. The next prime is 221322047. The reversal of 221322045 is 540223122.

It is not a de Polignac number, because 221322045 - 2³ = 221322037 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221322047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79375 + ... + 82115.

It is an arithmetic number, because the mean of its divisors is an integer number (12668040).

Almost surely, 2^221322045 is an apocalyptic number.

It is an amenable number.

221322045 is a deficient number, since it is larger than the sum of its proper divisors (184055235).

221322045 is a wasteful number, since it uses less digits than its factorization.

221322045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 221322045 is about 14876.8963497095. The cubic root of 221322045 is about 604.8878921660.

Adding to 221322045 its reverse (540223122), we get a palindrome (761545167).

The spelling of 221322045 in words is "two hundred twenty-one million, three hundred twenty-two thousand, forty-five".