11001111220221 has 32 divisors (see below), whose sum is σ = 15210088636416. Its totient is φ = 7065261720000.

The previous prime is 11001111220199. The next prime is 11001111220223. The reversal of 11001111220221 is 12202211110011.

It is a happy number.

It is not a de Polignac number, because 11001111220221 - 2¹¹ = 11001111218173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11001111220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001111220223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 175422171 + ... + 175484871.

It is an arithmetic number, because the mean of its divisors is an integer number (475315269888).

Almost surely, 2^{11001111220221} is an apocalyptic number.

It is an amenable number.

11001111220221 is a deficient number, since it is larger than the sum of its proper divisors (4208977416195).

11001111220221 is a wasteful number, since it uses less digits than its factorization.

11001111220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71273.

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

Adding to 11001111220221 its reverse (12202211110011), we get a palindrome (23203322330232).

The spelling of 11001111220221 in words is "eleven trillion, one billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-one".