11221221111100 has 144 divisors (see below), whose sum is σ = 32693773464576. Its totient is φ = 3228483168000.

The previous prime is 11221221111097. The next prime is 11221221111119. The reversal of 11221221111100 is 111112212211.

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 47 ways as a sum of consecutive naturals, for example, 55949956 + ... + 56150155.

It is an arithmetic number, because the mean of its divisors is an integer number (227040093504).

Almost surely, 2^{11221221111100} is an apocalyptic number.

11221221111100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11221221111100 is an abundant number, since it is smaller than the sum of its proper divisors (21472552353476).

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

11221221111100 is a wasteful number, since it uses less digits than its factorization.

11221221111100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112100156 (or 112100149 counting only the distinct ones).

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

Adding to 11221221111100 its reverse (111112212211), we get a palindrome (11332333323311).

The spelling of 11221221111100 in words is "eleven trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, one hundred".