1121021011 has 4 divisors (see below), whose sum is σ = 1222932024. Its totient is φ = 1019110000.

The previous prime is 1121020993. The next prime is 1121021093. The reversal of 1121021011 is 1101201211.

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 1121021011 - 2⁹ = 1121020499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121021611) 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, 50955490 + ... + 50955511.

It is an arithmetic number, because the mean of its divisors is an integer number (305733006).

Almost surely, 2^1121021011 is an apocalyptic number.

1121021011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1121021011 is a deficient number, since it is larger than the sum of its proper divisors (101911013).

1121021011 is a wasteful number, since it uses less digits than its factorization.

1121021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101911012.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1121021011 is about 33481.6518559046. The cubic root of 1121021011 is about 1038.8142955728.

Adding to 1121021011 its reverse (1101201211), we get a palindrome (2222222222).

The spelling of 1121021011 in words is "one billion, one hundred twenty-one million, twenty-one thousand, eleven".