1121011111 has 4 divisors (see below), whose sum is σ = 1222921224. Its totient is φ = 1019101000.

The previous prime is 1121011081. The next prime is 1121011123. The reversal of 1121011111 is 1111101211.

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

It is a cyclic number.

It is not a de Polignac number, because 1121011111 - 2⁹ = 1121010599 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 (1121011511) 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, 50955040 + ... + 50955061.

It is an arithmetic number, because the mean of its divisors is an integer number (305730306).

Almost surely, 2^1121011111 is an apocalyptic number.

1121011111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1121011111 is a deficient number, since it is larger than the sum of its proper divisors (101910113).

1121011111 is a wasteful number, since it uses less digits than its factorization.

1121011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101910112.

The product of its (nonzero) digits is 2, while the sum is 10.

The square root of 1121011111 is about 33481.5040134102. The cubic root of 1121011111 is about 1038.8112375594.

Adding to 1121011111 its reverse (1111101211), we get a palindrome (2232112322).

The spelling of 1121011111 in words is "one billion, one hundred twenty-one million, eleven thousand, one hundred eleven".