21111101121020 has 24 divisors (see below), whose sum is σ = 44333801119104. Its totient is φ = 8444347350336.

The previous prime is 21111101120987. The next prime is 21111101121203. The reversal of 21111101121020 is 2012110111112.

It is a junction number, because it is equal to n+sod(n) for n = 21111101120986 and 21111101121004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3944459 + ... + 7601378.

It is an arithmetic number, because the mean of its divisors is an integer number (1847241713296).

Almost surely, 2^{21111101121020} is an apocalyptic number.

21111101121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21111101121020 is an abundant number, since it is smaller than the sum of its proper divisors (23222699998084).

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

21111101121020 is a wasteful number, since it uses less digits than its factorization.

21111101121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11637269 (or 11637267 counting only the distinct ones).

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

Adding to 21111101121020 its reverse (2012110111112), we get a palindrome (23123211232132).

The spelling of 21111101121020 in words is "twenty-one trillion, one hundred eleven billion, one hundred one million, one hundred twenty-one thousand, twenty".