21100120232100 has 576 divisors, whose sum is σ = 75662749274112. Its totient is φ = 4420894464000.

The previous prime is 21100120232083. The next prime is 21100120232123. The reversal of 21100120232100 is 123202100112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21100120232100.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 3070891665 + ... + 3070898535.

It is an arithmetic number, because the mean of its divisors is an integer number (131358939712).

Almost surely, 2^{21100120232100} is an apocalyptic number.

21100120232100 is a gapful number since it is divisible by the number (20) 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 21100120232100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37831374637056).

21100120232100 is an abundant number, since it is smaller than the sum of its proper divisors (54562629042012).

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

21100120232100 is a wasteful number, since it uses less digits than its factorization.

21100120232100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7676 (or 7669 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21100120232100 its reverse (123202100112), we get a palindrome (21223322332212).

The spelling of 21100120232100 in words is "twenty-one trillion, one hundred billion, one hundred twenty million, two hundred thirty-two thousand, one hundred".