21111121112020 has 24 divisors (see below), whose sum is σ = 44333444955744. Its totient is φ = 8444431183776.

The previous prime is 21111121111967. The next prime is 21111121112021. The reversal of 21111121112020 is 2021112111112.

It is a super-3 number, since 3×21111121112020³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21111121111985 and 21111121112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111121112021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14290999 + ... + 15698881.

It is an arithmetic number, because the mean of its divisors is an integer number (1847226873156).

Almost surely, 2^{21111121112020} is an apocalyptic number.

21111121112020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111121112020 is an abundant number, since it is smaller than the sum of its proper divisors (23222323843724).

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

21111121112020 is a wasteful number, since it uses less digits than its factorization.

21111121112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157639 (or 2157637 counting only the distinct ones).

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

Adding to 21111121112020 its reverse (2021112111112), we get a palindrome (23132233223132).

The spelling of 21111121112020 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twelve thousand, twenty".