102111111220 has 24 divisors (see below), whose sum is σ = 218479247784. Its totient is φ = 40073794176.

The previous prime is 102111111217. The next prime is 102111111227. The reversal of 102111111220 is 22111111201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 54148359204 + 47962752016 = 232698^2 + 219004^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 102111111220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111111227) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 48164559 + ... + 48166678.

It is an arithmetic number, because the mean of its divisors is an integer number (9103301991).

Almost surely, 2^102111111220 is an apocalyptic number.

102111111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102111111220 is an abundant number, since it is smaller than the sum of its proper divisors (116368136564).

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

102111111220 is a wasteful number, since it uses less digits than its factorization.

102111111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96331299 (or 96331297 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 102111111220 its reverse (22111111201), we get a palindrome (124222222421).

The spelling of 102111111220 in words is "one hundred two billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty".