102111121220 has 12 divisors (see below), whose sum is σ = 214433354604. Its totient is φ = 40844448480.

The previous prime is 102111121159. The next prime is 102111121243. The reversal of 102111121220 is 22121111201.

It can be written as a sum of positive squares in 2 ways, for example, as 15101460544 + 87009660676 = 122888^2 + 294974^2 .

It is a junction number, because it is equal to n+sod(n) for n = 102111121195 and 102111121204.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2552778011 + ... + 2552778050.

It is an arithmetic number, because the mean of its divisors is an integer number (17869446217).

Almost surely, 2^102111121220 is an apocalyptic number.

102111121220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102111121220 is an abundant number, since it is smaller than the sum of its proper divisors (112322233384).

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

102111121220 is a wasteful number, since it uses less digits than its factorization.

102111121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5105556070 (or 5105556068 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 102111121220 its reverse (22121111201), we get a palindrome (124232232421).

The spelling of 102111121220 in words is "one hundred two billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty".