1121220321 has 16 divisors (see below), whose sum is σ = 1636353600. Its totient is φ = 678669120.

The previous prime is 1121220311. The next prime is 1121220323. The reversal of 1121220321 is 1230221211.

It is not a de Polignac number, because 1121220321 - 2⁶ = 1121220257 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121220321.

It is not an unprimeable number, because it can be changed into a prime (1121220323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 233271 + ... + 238028.

It is an arithmetic number, because the mean of its divisors is an integer number (102272100).

Almost surely, 2^1121220321 is an apocalyptic number.

It is an amenable number.

1121220321 is a deficient number, since it is larger than the sum of its proper divisors (515133279).

1121220321 is a wasteful number, since it uses less digits than its factorization.

1121220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471376.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1121220321 is about 33484.6281299345. The cubic root of 1121220321 is about 1038.8758566574.

Adding to 1121220321 its reverse (1230221211), we get a palindrome (2351441532).

The spelling of 1121220321 in words is "one billion, one hundred twenty-one million, two hundred twenty thousand, three hundred twenty-one".