1100209121 has 4 divisors (see below), whose sum is σ = 1200228144. Its totient is φ = 1000190100.

The previous prime is 1100209109. The next prime is 1100209147. The reversal of 1100209121 is 1219020011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1219020011 = 11 ⋅110820001.

It is a cyclic number.

It is not a de Polignac number, because 1100209121 - 2³⁰ = 26467297 is a prime.

It is a Duffinian number.

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 1100209121.

It is not an unprimeable number, because it can be changed into a prime (1100209151) 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, 50009495 + ... + 50009516.

It is an arithmetic number, because the mean of its divisors is an integer number (300057036).

Almost surely, 2^1100209121 is an apocalyptic number.

1100209121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1100209121 is a deficient number, since it is larger than the sum of its proper divisors (100019023).

1100209121 is a wasteful number, since it uses less digits than its factorization.

1100209121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100019022.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1100209121 is about 33169.4003714267. The cubic root of 1100209121 is about 1032.3455269023.

Adding to 1100209121 its reverse (1219020011), we get a palindrome (2319229132).

The spelling of 1100209121 in words is "one billion, one hundred million, two hundred nine thousand, one hundred twenty-one".