1011201221 has 4 divisors (see below), whose sum is σ = 1013801100. Its totient is φ = 1008601344.

The previous prime is 1011201211. The next prime is 1011201227. The reversal of 1011201221 is 1221021101.

1011201221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1221021101 = 163 ⋅7490927.

It can be written as a sum of positive squares in 2 ways, for example, as 600936196 + 410265025 = 24514^2 + 20255^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1011201221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011201227) 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, 1299356 + ... + 1300133.

It is an arithmetic number, because the mean of its divisors is an integer number (253450275).

Almost surely, 2^1011201221 is an apocalyptic number.

It is an amenable number.

1011201221 is a deficient number, since it is larger than the sum of its proper divisors (2599879).

1011201221 is an equidigital number, since it uses as much as digits as its factorization.

1011201221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599878.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1011201221 is about 31799.3902614500. The cubic root of 1011201221 is about 1003.7198856262.

Adding to 1011201221 its reverse (1221021101), we get a palindrome (2232222322).

The spelling of 1011201221 in words is "one billion, eleven million, two hundred one thousand, two hundred twenty-one".