11101220011221 has 4 divisors (see below), whose sum is σ = 14801626681632. Its totient is φ = 7400813340812.

The previous prime is 11101220011207. The next prime is 11101220011267. The reversal of 11101220011221 is 12211002210111.

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 11101220011221 - 2²¹ = 11101217914069 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11101220011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11101220011201) 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, 1850203335201 + ... + 1850203335206.

It is an arithmetic number, because the mean of its divisors is an integer number (3700406670408).

Almost surely, 2^{11101220011221} is an apocalyptic number.

It is an amenable number.

11101220011221 is a deficient number, since it is larger than the sum of its proper divisors (3700406670411).

11101220011221 is an equidigital number, since it uses as much as digits as its factorization.

11101220011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700406670410.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 11101220011221 its reverse (12211002210111), we get a palindrome (23312222221332).

The spelling of 11101220011221 in words is "eleven trillion, one hundred one billion, two hundred twenty million, eleven thousand, two hundred twenty-one".