11211100010221 has 4 divisors (see below), whose sum is σ = 11227659981372. Its totient is φ = 11194540039072.

The previous prime is 11211100010197. The next prime is 11211100010261. The reversal of 11211100010221 is 12201000111211.

It is a happy number.

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 6563259876996 + 4647840133225 = 2561886^2 + 2155885^2 .

It is a cyclic number.

It is not a de Polignac number, because 11211100010221 - 2⁹ = 11211100009709 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 (11211100010261) 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, 8279984560 + ... + 8279985913.

It is an arithmetic number, because the mean of its divisors is an integer number (2806914995343).

Almost surely, 2^{11211100010221} is an apocalyptic number.

It is an amenable number.

11211100010221 is a deficient number, since it is larger than the sum of its proper divisors (16559971151).

11211100010221 is an equidigital number, since it uses as much as digits as its factorization.

11211100010221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16559971150.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11211100010221 its reverse (12201000111211), we get a palindrome (23412100121432).

The spelling of 11211100010221 in words is "eleven trillion, two hundred eleven billion, one hundred million, ten thousand, two hundred twenty-one".