1100211221 has 4 divisors (see below), whose sum is σ = 1116632352. Its totient is φ = 1083790092.

The previous prime is 1100211163. The next prime is 1100211241. The reversal of 1100211221 is 1221120011.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1100211221 - 2⁶ = 1100211157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100211241) 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 3 ways as a sum of consecutive naturals, for example, 8210465 + ... + 8210598.

It is an arithmetic number, because the mean of its divisors is an integer number (279158088).

Almost surely, 2^1100211221 is an apocalyptic number.

It is an amenable number.

1100211221 is a deficient number, since it is larger than the sum of its proper divisors (16421131).

1100211221 is an equidigital number, since it uses as much as digits as its factorization.

1100211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16421130.

The product of its (nonzero) digits is 8, while the sum is 11.

The square root of 1100211221 is about 33169.4320270939. The cubic root of 1100211221 is about 1032.3461837242.

Adding to 1100211221 its reverse (1221120011), we get a palindrome (2321331232).

The spelling of 1100211221 in words is "one billion, one hundred million, two hundred eleven thousand, two hundred twenty-one".