1100212221 has 4 divisors (see below), whose sum is σ = 1466949632. Its totient is φ = 733474812.

The previous prime is 1100212193. The next prime is 1100212229. The reversal of 1100212221 is 1222120011.

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 not a de Polignac number, because 1100212221 - 2⁵ = 1100212189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1100212197 and 1100212206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100212229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183368701 + ... + 183368706.

It is an arithmetic number, because the mean of its divisors is an integer number (366737408).

Almost surely, 2^1100212221 is an apocalyptic number.

It is an amenable number.

1100212221 is a deficient number, since it is larger than the sum of its proper divisors (366737411).

1100212221 is an equidigital number, since it uses as much as digits as its factorization.

1100212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366737410.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1100212221 is about 33169.4471012105. The cubic root of 1100212221 is about 1032.3464964962.

Adding to 1100212221 its reverse (1222120011), we get a palindrome (2322332232).

The spelling of 1100212221 in words is "one billion, one hundred million, two hundred twelve thousand, two hundred twenty-one".