1121271221 has 8 divisors (see below), whose sum is σ = 1282335744. Its totient is φ = 960427440.

The previous prime is 1121271191. The next prime is 1121271241. The reversal of 1121271221 is 1221721211.

It is a happy number.

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

It is not a de Polignac number, because 1121271221 - 2¹⁰ = 1121270197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121271193 and 1121271202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121271241) 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, 44150 + ... + 64743.

It is an arithmetic number, because the mean of its divisors is an integer number (160291968).

Almost surely, 2^1121271221 is an apocalyptic number.

It is an amenable number.

1121271221 is a deficient number, since it is larger than the sum of its proper divisors (161064523).

1121271221 is a wasteful number, since it uses less digits than its factorization.

1121271221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110371.

The product of its digits is 112, while the sum is 20.

The square root of 1121271221 is about 33485.3881715592. The cubic root of 1121271221 is about 1038.8915770233.

Adding to 1121271221 its reverse (1221721211), we get a palindrome (2342992432).

The spelling of 1121271221 in words is "one billion, one hundred twenty-one million, two hundred seventy-one thousand, two hundred twenty-one".