1121221011 has 4 divisors (see below), whose sum is σ = 1494961352. Its totient is φ = 747480672.

The previous prime is 1121220967. The next prime is 1121221019. The reversal of 1121221011 is 1101221211.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1121221011 - 2¹⁰ = 1121219987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121221019) 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, 186870166 + ... + 186870171.

It is an arithmetic number, because the mean of its divisors is an integer number (373740338).

Almost surely, 2^1121221011 is an apocalyptic number.

1121221011 is a deficient number, since it is larger than the sum of its proper divisors (373740341).

1121221011 is an equidigital number, since it uses as much as digits as its factorization.

1121221011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373740340.

The product of its (nonzero) digits is 8, while the sum is 12.

The square root of 1121221011 is about 33484.6384331681. The cubic root of 1121221011 is about 1038.8760697658.

Adding to 1121221011 its reverse (1101221211), we get a palindrome (2222442222).

It can be divided in two parts, 11212 and 21011, that added together give a palindrome (32223).

The spelling of 1121221011 in words is "one billion, one hundred twenty-one million, two hundred twenty-one thousand, eleven".