21110111210100 has 288 divisors, whose sum is σ = 67256977277952. Its totient is φ = 5069675520000.

The previous prime is 21110111210059. The next prime is 21110111210119. The reversal of 21110111210100 is 101211101112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 249394785 + ... + 249479415.

It is an arithmetic number, because the mean of its divisors is an integer number (233531171104).

Almost surely, 2^{21110111210100} is an apocalyptic number.

21110111210100 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 21110111210100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33628488638976).

21110111210100 is an abundant number, since it is smaller than the sum of its proper divisors (46146866067852).

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

21110111210100 is a wasteful number, since it uses less digits than its factorization.

21110111210100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85367 (or 85360 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21110111210100 its reverse (101211101112), we get a palindrome (21211322311212).

The spelling of 21110111210100 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, two hundred ten thousand, one hundred".