102021112100 has 72 divisors (see below), whose sum is σ = 223549290888. Its totient is φ = 40410316800.

The previous prime is 102021112057. The next prime is 102021112117. The reversal of 102021112100 is 1211120201.

It can be written as a sum of positive squares in 12 ways, for example, as 11679989476 + 90341122624 = 108074^2 + 300568^2 .

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 23 ways as a sum of consecutive naturals, for example, 14652620 + ... + 14659580.

Almost surely, 2^102021112100 is an apocalyptic number.

102021112100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 102021112100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111774645444).

102021112100 is an abundant number, since it is smaller than the sum of its proper divisors (121528178788).

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

102021112100 is a wasteful number, since it uses less digits than its factorization.

102021112100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8385 (or 8378 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 102021112100 its reverse (1211120201), we get a palindrome (103232232301).

The spelling of 102021112100 in words is "one hundred two billion, twenty-one million, one hundred twelve thousand, one hundred".