1100011221 has 12 divisors (see below), whose sum is σ = 1631848972. Its totient is φ = 713520576.

The previous prime is 1100011207. The next prime is 1100011229. The reversal of 1100011221 is 1221100011.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 759608721 + 340402500 = 27561^2 + 18450^2 .

It is not a de Polignac number, because 1100011221 - 2⁵ = 1100011189 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100011229) 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, 1651336 + ... + 1652001.

Almost surely, 2^1100011221 is an apocalyptic number.

It is an amenable number.

1100011221 is a deficient number, since it is larger than the sum of its proper divisors (531837751).

1100011221 is a wasteful number, since it uses less digits than its factorization.

1100011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3303380 (or 3303377 counting only the distinct ones).

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

The square root of 1100011221 is about 33166.4170660625. The cubic root of 1100011221 is about 1032.2836255096.

Adding to 1100011221 its reverse (1221100011), we get a palindrome (2321111232).

The spelling of 1100011221 in words is "one billion, one hundred million, eleven thousand, two hundred twenty-one".