1001201221 has 4 divisors (see below), whose sum is σ = 1001631244. Its totient is φ = 1000771200.

The previous prime is 1001201197. The next prime is 1001201231. The reversal of 1001201221 is 1221021001.

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 528356196 + 472845025 = 22986^2 + 21745^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001201221 - 2⁵ = 1001201189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001201198 and 1001201207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001201231) 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 3 ways as a sum of consecutive naturals, for example, 211500 + ... + 216181.

It is an arithmetic number, because the mean of its divisors is an integer number (250407811).

Almost surely, 2^1001201221 is an apocalyptic number.

It is an amenable number.

1001201221 is a deficient number, since it is larger than the sum of its proper divisors (430023).

1001201221 is an equidigital number, since it uses as much as digits as its factorization.

1001201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430022.

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

The square root of 1001201221 is about 31641.7638730839. The cubic root of 1001201221 is about 1000.4002467811.

Adding to 1001201221 its reverse (1221021001), we get a palindrome (2222222222).

The spelling of 1001201221 in words is "one billion, one million, two hundred one thousand, two hundred twenty-one".