11211101222221 has 4 divisors (see below), whose sum is σ = 11353013896000. Its totient is φ = 11069188548444.

The previous prime is 11211101222219. The next prime is 11211101222227. The reversal of 11211101222221 is 12222210111211.

It is a happy number.

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 11211101222221 - 2¹ = 11211101222219 is a prime.

It is a super-2 number, since 2×11211101222221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211101222227) 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, 70956336771 + ... + 70956336928.

It is an arithmetic number, because the mean of its divisors is an integer number (2838253474000).

Almost surely, 2^{11211101222221} is an apocalyptic number.

It is an amenable number.

11211101222221 is a deficient number, since it is larger than the sum of its proper divisors (141912673779).

11211101222221 is an equidigital number, since it uses as much as digits as its factorization.

11211101222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141912673778.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 11211101222221 its reverse (12222210111211), we get a palindrome (23433311333432).

The spelling of 11211101222221 in words is "eleven trillion, two hundred eleven billion, one hundred one million, two hundred twenty-two thousand, two hundred twenty-one".