21110111112020 has 144 divisors (see below), whose sum is σ = 54092558916480. Its totient is φ = 6760238849280.

The previous prime is 21110111111993. The next prime is 21110111112029. The reversal of 21110111112020 is 2021111101112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21110111111986 and 21110111112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110111112029) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12621902 + ... + 14196218.

Almost surely, 2^{21110111112020} is an apocalyptic number.

21110111112020 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 21110111112020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27046279458240).

21110111112020 is an abundant number, since it is smaller than the sum of its proper divisors (32982447804460).

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

21110111112020 is a wasteful number, since it uses less digits than its factorization.

21110111112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1574494 (or 1574421 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21110111112020 its reverse (2021111101112), we get a palindrome (23131222213132).

The spelling of 21110111112020 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, one hundred twelve thousand, twenty".