102111111221020 has 48 divisors (see below), whose sum is σ = 239367442140288. Its totient is φ = 36267794256960.

The previous prime is 102111111220969. The next prime is 102111111221023. The reversal of 102111111221020 is 20122111111201.

It is a junction number, because it is equal to n+sod(n) for n = 102111111220985 and 102111111221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102111111221023) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5396983734 + ... + 5397002653.

It is an arithmetic number, because the mean of its divisors is an integer number (4986821711256).

Almost surely, 2^{102111111221020} is an apocalyptic number.

102111111221020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102111111221020 is an abundant number, since it is smaller than the sum of its proper divisors (137256330919268).

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

102111111221020 is a wasteful number, since it uses less digits than its factorization.

102111111221020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10793986450 (or 10793986448 counting only the distinct ones).

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

Adding to 102111111221020 its reverse (20122111111201), we get a palindrome (122233222332221).

The spelling of 102111111221020 in words is "one hundred two trillion, one hundred eleven billion, one hundred eleven million, two hundred twenty-one thousand, twenty".