201221012 has 6 divisors (see below), whose sum is σ = 352136778. Its totient is φ = 100610504.

The previous prime is 201221011. The next prime is 201221017. The reversal of 201221012 is 210122102.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 185885956 + 15335056 = 13634^2 + 3916^2 .

It is a junction number, because it is equal to n+sod(n) for n = 201220984 and 201221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221011) 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 as a sum of consecutive naturals, namely, 25152623 + ... + 25152630.

It is an arithmetic number, because the mean of its divisors is an integer number (58689463).

Almost surely, 2^201221012 is an apocalyptic number.

It is an amenable number.

201221012 is a deficient number, since it is larger than the sum of its proper divisors (150915766).

201221012 is a wasteful number, since it uses less digits than its factorization.

201221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50305257 (or 50305255 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 201221012 is about 14185.2392295654. The cubic root of 201221012 is about 585.9912208883.

Adding to 201221012 its reverse (210122102), we get a palindrome (411343114).

The spelling of 201221012 in words is "two hundred one million, two hundred twenty-one thousand, twelve".