221145201 has 8 divisors (see below), whose sum is σ = 327622560. Its totient is φ = 147430116.

The previous prime is 221145187. The next prime is 221145233. The reversal of 221145201 is 102541122.

221145201 is a `hidden beast` number, since 2 + 211 + 452 + 0 + 1 = 666.

221145201 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221145201 - 2⁶ = 221145137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221145101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4095255 + ... + 4095308.

It is an arithmetic number, because the mean of its divisors is an integer number (40952820).

Almost surely, 2^221145201 is an apocalyptic number.

It is an amenable number.

221145201 is a deficient number, since it is larger than the sum of its proper divisors (106477359).

221145201 is an equidigital number, since it uses as much as digits as its factorization.

221145201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8190572 (or 8190566 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 221145201 is about 14870.9515835403. The cubic root of 221145201 is about 604.7267404257.

Adding to 221145201 its reverse (102541122), we get a palindrome (323686323).

The spelling of 221145201 in words is "two hundred twenty-one million, one hundred forty-five thousand, two hundred one".