1100021121 has 16 divisors (see below), whose sum is σ = 1631065920. Its totient is φ = 732715200.

The previous prime is 1100021107. The next prime is 1100021129. The reversal of 1100021121 is 1211200011.

It is a happy number.

It is not a de Polignac number, because 1100021121 - 2⁵ = 1100021089 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1100021129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15466 + ... + 49388.

It is an arithmetic number, because the mean of its divisors is an integer number (101941620).

Almost surely, 2^1100021121 is an apocalyptic number.

It is an amenable number.

1100021121 is a deficient number, since it is larger than the sum of its proper divisors (531044799).

1100021121 is a wasteful number, since it uses less digits than its factorization.

1100021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35133 (or 35127 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1100021121 is about 33166.5663130810. The cubic root of 1100021121 is about 1032.2867223196.

Adding to 1100021121 its reverse (1211200011), we get a palindrome (2311221132).

The spelling of 1100021121 in words is "one billion, one hundred million, twenty-one thousand, one hundred twenty-one".