201221305 has 8 divisors (see below), whose sum is σ = 254174400. Its totient is φ = 152504496.

The previous prime is 201221291. The next prime is 201221309. The reversal of 201221305 is 503122102.

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

It is a cyclic number.

It is not a de Polignac number, because 201221305 - 2⁷ = 201221177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201221309) 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, 1058965 + ... + 1059154.

It is an arithmetic number, because the mean of its divisors is an integer number (31771800).

Almost surely, 2^201221305 is an apocalyptic number.

It is an amenable number.

201221305 is a deficient number, since it is larger than the sum of its proper divisors (52953095).

201221305 is a wasteful number, since it uses less digits than its factorization.

201221305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2118143.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 201221305 is about 14185.2495571985. The cubic root of 201221305 is about 585.9915053108.

Adding to 201221305 its reverse (503122102), we get a palindrome (704343407).

The spelling of 201221305 in words is "two hundred one million, two hundred twenty-one thousand, three hundred five".