201211221 has 8 divisors (see below), whose sum is σ = 270886720. Its totient is φ = 132838272.

The previous prime is 201211189. The next prime is 201211229. The reversal of 201211221 is 122112102.

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

It is not a de Polignac number, because 201211221 - 2⁵ = 201211189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 201211197 and 201211206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201211229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325276 + ... + 325893.

It is an arithmetic number, because the mean of its divisors is an integer number (33860840).

Almost surely, 2^201211221 is an apocalyptic number.

It is an amenable number.

201211221 is a deficient number, since it is larger than the sum of its proper divisors (69675499).

201211221 is a wasteful number, since it uses less digits than its factorization.

201211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651275.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 201211221 is about 14184.8941131050. The cubic root of 201211221 is about 585.9817163589.

Adding to 201211221 its reverse (122112102), we get a palindrome (323323323).

The spelling of 201211221 in words is "two hundred one million, two hundred eleven thousand, two hundred twenty-one".