1101001221 has 16 divisors (see below), whose sum is σ = 1632995520. Its totient is φ = 733153680.

The previous prime is 1101001207. The next prime is 1101001241. The reversal of 1101001221 is 1221001011.

It is a happy number.

It is not a de Polignac number, because 1101001221 - 2⁶ = 1101001157 is a prime.

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

1101001221 is a modest number, since divided by 1221 gives 1101 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101001241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 751 + ... + 46931.

It is an arithmetic number, because the mean of its divisors is an integer number (102062220).

Almost surely, 2^1101001221 is an apocalyptic number.

It is an amenable number.

1101001221 is a deficient number, since it is larger than the sum of its proper divisors (531994299).

1101001221 is an equidigital number, since it uses as much as digits as its factorization.

1101001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47073 (or 47067 counting only the distinct ones).

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

The square root of 1101001221 is about 33181.3384449754. The cubic root of 1101001221 is about 1032.5932145810.

Adding to 1101001221 its reverse (1221001011), we get a palindrome (2322002232).

The spelling of 1101001221 in words is "one billion, one hundred one million, one thousand, two hundred twenty-one".