221353045 has 8 divisors (see below), whose sum is σ = 267092280. Its totient is φ = 176103360.

The previous prime is 221353043. The next prime is 221353061. The reversal of 221353045 is 540353122.

It can be written as a sum of positive squares in 4 ways, for example, as 12348196 + 209004849 = 3514^2 + 14457^2 .

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

It is not a de Polignac number, because 221353045 - 2¹ = 221353043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221353043) 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, 121390 + ... + 123199.

It is an arithmetic number, because the mean of its divisors is an integer number (33386535).

Almost surely, 2^221353045 is an apocalyptic number.

It is an amenable number.

221353045 is a deficient number, since it is larger than the sum of its proper divisors (45739235).

221353045 is a wasteful number, since it uses less digits than its factorization.

221353045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244775.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 221353045 is about 14877.9381972100. The cubic root of 221353045 is about 604.9161325359.

The spelling of 221353045 in words is "two hundred twenty-one million, three hundred fifty-three thousand, forty-five".