111220212100 has 36 divisors (see below), whose sum is σ = 247234402548. Its totient is φ = 43403008000.

The previous prime is 111220212079. The next prime is 111220212107. The reversal of 111220212100 is 1212022111.

It can be written as a sum of positive squares in 6 ways, for example, as 4109322816 + 107110889284 = 64104^2 + 327278^2 .

It is not an unprimeable number, because it can be changed into a prime (111220212107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13559341 + ... + 13567540.

It is an arithmetic number, because the mean of its divisors is an integer number (6867622293).

Almost surely, 2^111220212100 is an apocalyptic number.

111220212100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111220212100 is an abundant number, since it is smaller than the sum of its proper divisors (136014190448).

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

111220212100 is a wasteful number, since it uses less digits than its factorization.

111220212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27126936 (or 27126929 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 111220212100 its reverse (1212022111), we get a palindrome (112432234211).

The spelling of 111220212100 in words is "one hundred eleven billion, two hundred twenty million, two hundred twelve thousand, one hundred".