11111221202228 has 18 divisors (see below), whose sum is σ = 22619271733506. Its totient is φ = 4761951943728.

The previous prime is 11111221202227. The next prime is 11111221202359. The reversal of 11111221202228 is 82220212211111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11107635827344 + 3585374884 = 3332812^2 + 59878^2 .

It is a junction number, because it is equal to n+sod(n) for n = 11111221202197 and 11111221202206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111221202227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28344951851 + ... + 28344952242.

It is an arithmetic number, because the mean of its divisors is an integer number (1256626207417).

Almost surely, 2^{11111221202228} is an apocalyptic number.

It is an amenable number.

11111221202228 is an abundant number, since it is smaller than the sum of its proper divisors (11508050531278).

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

11111221202228 is a wasteful number, since it uses less digits than its factorization.

11111221202228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56689904111 (or 56689904102 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 26.

Adding to 11111221202228 its reverse (82220212211111), we get a palindrome (93331433413339).

The spelling of 11111221202228 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-one million, two hundred two thousand, two hundred twenty-eight".