11112221121102 has 64 divisors (see below), whose sum is σ = 25536165580800. Its totient is φ = 3578151633120.

The previous prime is 11112221121097. The next prime is 11112221121121. The reversal of 11112221121102 is 20112112221111.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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, 5026402 + ... + 6891237.

It is an arithmetic number, because the mean of its divisors is an integer number (399002587200).

Almost surely, 2^{11112221121102} is an apocalyptic number.

11112221121102 is an abundant number, since it is smaller than the sum of its proper divisors (14423944459698).

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

11112221121102 is a wasteful number, since it uses less digits than its factorization.

11112221121102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11918238 (or 11918232 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 11112221121102 its reverse (20112112221111), we get a palindrome (31224333342213).

The spelling of 11112221121102 in words is "eleven trillion, one hundred twelve billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred two".