1121021111 has 12 divisors (see below), whose sum is σ = 1309023888. Its totient is φ = 940418112.

The previous prime is 1121021093. The next prime is 1121021117. The reversal of 1121021111 is 1111201211.

It is not a de Polignac number, because 1121021111 - 2¹⁴ = 1121004727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121021092 and 1121021101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121021117) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20786 + ... + 51711.

It is an arithmetic number, because the mean of its divisors is an integer number (109085324).

Almost surely, 2^1121021111 is an apocalyptic number.

1121021111 is a deficient number, since it is larger than the sum of its proper divisors (188002777).

1121021111 is an frugal number, since it uses more digits than its factorization.

1121021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72598 (or 72551 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

The square root of 1121021111 is about 33481.6533492598. The cubic root of 1121021111 is about 1038.8143264617.

Adding to 1121021111 its reverse (1111201211), we get a palindrome (2232222322).

The spelling of 1121021111 in words is "one billion, one hundred twenty-one million, twenty-one thousand, one hundred eleven".