221052145 has 4 divisors (see below), whose sum is σ = 265262580. Its totient is φ = 176841712.

The previous prime is 221052113. The next prime is 221052187. The reversal of 221052145 is 541250122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51609856 + 169442289 = 7184^2 + 13017^2 .

It is a cyclic number.

It is not a de Polignac number, because 221052145 - 2⁵ = 221052113 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22105210 + ... + 22105219.

It is an arithmetic number, because the mean of its divisors is an integer number (66315645).

Almost surely, 2^221052145 is an apocalyptic number.

It is an amenable number.

221052145 is a deficient number, since it is larger than the sum of its proper divisors (44210435).

221052145 is an equidigital number, since it uses as much as digits as its factorization.

221052145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44210434.

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 221052145 is about 14867.8224700189. The cubic root of 221052145 is about 604.6419072538.

The spelling of 221052145 in words is "two hundred twenty-one million, fifty-two thousand, one hundred forty-five".