21020110111100 has 36 divisors (see below), whose sum is σ = 47085046655808. Its totient is φ = 8136816816000.

The previous prime is 21020110111087. The next prime is 21020110111127. The reversal of 21020110111100 is 111101102012.

21020110111100 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3390337241 + ... + 3390343440.

Almost surely, 2^{21020110111100} is an apocalyptic number.

21020110111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020110111100 is an abundant number, since it is smaller than the sum of its proper divisors (26064936544708).

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

21020110111100 is a wasteful number, since it uses less digits than its factorization.

21020110111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780680726 (or 6780680719 counting only the distinct ones).

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

Adding to 21020110111100 its reverse (111101102012), we get a palindrome (21131211213112).

The spelling of 21020110111100 in words is "twenty-one trillion, twenty billion, one hundred ten million, one hundred eleven thousand, one hundred".