1100101221 has 12 divisors (see below), whose sum is σ = 1590503148. Its totient is φ = 732723264.

The previous prime is 1100101199. The next prime is 1100101271. The reversal of 1100101221 is 1221010011.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 780084900 + 320016321 = 27930^2 + 17889^2 .

It is not a de Polignac number, because 1100101221 - 2⁶ = 1100101157 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 (1100101271) 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 11 ways as a sum of consecutive naturals, for example, 46080 + ... + 65753.

It is an arithmetic number, because the mean of its divisors is an integer number (132541929).

Almost surely, 2^1100101221 is an apocalyptic number.

It is an amenable number.

1100101221 is a deficient number, since it is larger than the sum of its proper divisors (490401927).

1100101221 is a wasteful number, since it uses less digits than its factorization.

1100101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112932 (or 112929 counting only the distinct ones).

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

The square root of 1100101221 is about 33167.7738324416. The cubic root of 1100101221 is about 1032.3117776445.

Adding to 1100101221 its reverse (1221010011), we get a palindrome (2321111232).

The spelling of 1100101221 in words is "one billion, one hundred million, one hundred one thousand, two hundred twenty-one".