11111221220202 has 48 divisors (see below), whose sum is σ = 24258187699200. Its totient is φ = 3675497687136.

The previous prime is 11111221220171. The next prime is 11111221220237. The reversal of 11111221220202 is 20202212211111.

11111221220202 is a `hidden beast` number, since 1 + 11 + 11 + 221 + 220 + 202 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1009683 + ... + 4820985.

It is an arithmetic number, because the mean of its divisors is an integer number (505378910400).

Almost surely, 2^{11111221220202} is an apocalyptic number.

11111221220202 is an abundant number, since it is smaller than the sum of its proper divisors (13146966478998).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11111221220202 is a wasteful number, since it uses less digits than its factorization.

11111221220202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812547 (or 3812544 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 11111221220202 its reverse (20202212211111), we get a palindrome (31313433431313).

Subtracting 11111221220202 from its reverse (20202212211111), we obtain a palindrome (9090990990909).

The spelling of 11111221220202 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred twenty thousand, two hundred two".