11211120210221 has 4 divisors (see below), whose sum is σ = 11211133923132. Its totient is φ = 11211106497312.

The previous prime is 11211120210163. The next prime is 11211120210223. The reversal of 11211120210221 is 12201202111211.

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 1962770178121 + 9248350032100 = 1400989^2 + 3041110^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211120210221 - 2¹⁰ = 11211120209197 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 11211120210221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211120210223) 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, 5546720 + ... + 7293033.

It is an arithmetic number, because the mean of its divisors is an integer number (2802783480783).

Almost surely, 2^{11211120210221} is an apocalyptic number.

It is an amenable number.

11211120210221 is a deficient number, since it is larger than the sum of its proper divisors (13712911).

11211120210221 is an equidigital number, since it uses as much as digits as its factorization.

11211120210221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13712910.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11211120210221 its reverse (12201202111211), we get a palindrome (23412322321432).

The spelling of 11211120210221 in words is "eleven trillion, two hundred eleven billion, one hundred twenty million, two hundred ten thousand, two hundred twenty-one".