201161221 has 8 divisors (see below), whose sum is σ = 213332184. Its totient is φ = 189027840.

The previous prime is 201161183. The next prime is 201161273. The reversal of 201161221 is 122161102.

It can be written as a sum of positive squares in 4 ways, for example, as 20124196 + 181037025 = 4486^2 + 13455^2 .

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 201161221 - 2¹⁷ = 201030149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 201161195 and 201161204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201165221) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2041 + ... + 20161.

It is an arithmetic number, because the mean of its divisors is an integer number (26666523).

Almost surely, 2^201161221 is an apocalyptic number.

It is an amenable number.

201161221 is a deficient number, since it is larger than the sum of its proper divisors (12170963).

201161221 is a wasteful number, since it uses less digits than its factorization.

201161221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18791.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 201161221 is about 14183.1315653490. The cubic root of 201161221 is about 585.9331744785.

The spelling of 201161221 in words is "two hundred one million, one hundred sixty-one thousand, two hundred twenty-one".