1100212221221 has 4 divisors (see below), whose sum is σ = 1100334462444. Its totient is φ = 1100089980000.

The previous prime is 1100212221193. The next prime is 1100212221257. The reversal of 1100212221221 is 1221222120011.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 489040070596 + 611172150625 = 699314^2 + 781775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1100212221221 - 2¹⁰ = 1100212220197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1100212221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100212221281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61107110 + ... + 61125111.

It is an arithmetic number, because the mean of its divisors is an integer number (275083615611).

Almost surely, 2^{1100212221221} is an apocalyptic number.

It is an amenable number.

1100212221221 is a deficient number, since it is larger than the sum of its proper divisors (122241223).

1100212221221 is an equidigital number, since it uses as much as digits as its factorization.

1100212221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122241222.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1100212221221 its reverse (1221222120011), we get a palindrome (2321434341232).

The spelling of 1100212221221 in words is "one trillion, one hundred billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".