201101221 has 4 divisors (see below), whose sum is σ = 201566092. Its totient is φ = 200636352.

The previous prime is 201101209. The next prime is 201101231. The reversal of 201101221 is 122101102.

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 126900225 + 74200996 = 11265^2 + 8614^2 .

It is a cyclic number.

It is not a de Polignac number, because 201101221 - 2⁵ = 201101189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201101198 and 201101207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201101231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231786 + ... + 232651.

It is an arithmetic number, because the mean of its divisors is an integer number (50391523).

Almost surely, 2^201101221 is an apocalyptic number.

It is an amenable number.

201101221 is a deficient number, since it is larger than the sum of its proper divisors (464871).

201101221 is an equidigital number, since it uses as much as digits as its factorization.

201101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464870.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 201101221 is about 14181.0162188751. The cubic root of 201101221 is about 585.8749136034.

Adding to 201101221 its reverse (122101102), we get a palindrome (323202323).

The spelling of 201101221 in words is "two hundred one million, one hundred one thousand, two hundred twenty-one".