1101100221 has 24 divisors (see below), whose sum is σ = 1714167000. Its totient is φ = 677068416.

The previous prime is 1101100219. The next prime is 1101100237. The reversal of 1101100221 is 1220011011.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 195692121 + 905408100 = 13989^2 + 30090^2 .

It is not a de Polignac number, because 1101100221 - 2¹ = 1101100219 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101100201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 188655 + ... + 194403.

It is an arithmetic number, because the mean of its divisors is an integer number (71423625).

Almost surely, 2^1101100221 is an apocalyptic number.

It is an amenable number.

1101100221 is a deficient number, since it is larger than the sum of its proper divisors (613066779).

1101100221 is a wasteful number, since it uses less digits than its factorization.

1101100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7405 (or 7402 counting only the distinct ones).

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

The square root of 1101100221 is about 33182.8302138320. The cubic root of 1101100221 is about 1032.6241632795.

Adding to 1101100221 its reverse (1220011011), we get a palindrome (2321111232).

The spelling of 1101100221 in words is "one billion, one hundred one million, one hundred thousand, two hundred twenty-one".