21110111001020 has 12 divisors (see below), whose sum is σ = 44331233102184. Its totient is φ = 8444044400400.

The previous prime is 21110111000981. The next prime is 21110111001107. The reversal of 21110111001020 is 2010011101112.

It is a junction number, because it is equal to n+sod(n) for n = 21110111000992 and 21110111001010.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527752775006 + ... + 527752775045.

It is an arithmetic number, because the mean of its divisors is an integer number (3694269425182).

Almost surely, 2^{21110111001020} is an apocalyptic number.

21110111001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110111001020 is an abundant number, since it is smaller than the sum of its proper divisors (23221122101164).

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

21110111001020 is a wasteful number, since it uses less digits than its factorization.

21110111001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055505550060 (or 1055505550058 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21110111001020 its reverse (2010011101112), we get a palindrome (23120122102132).

The spelling of 21110111001020 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million, one thousand, twenty".