21000112111100 has 18 divisors (see below), whose sum is σ = 45570243281304. Its totient is φ = 8400044844400.

The previous prime is 21000112111091. The next prime is 21000112111141. The reversal of 21000112111100 is 111121100012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 105000560456 + ... + 105000560655.

Almost surely, 2^{21000112111100} is an apocalyptic number.

21000112111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21000112111100 is an abundant number, since it is smaller than the sum of its proper divisors (24570131170204).

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

21000112111100 is a wasteful number, since it uses less digits than its factorization.

21000112111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210001121125 (or 210001121118 counting only the distinct ones).

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

Adding to 21000112111100 its reverse (111121100012), we get a palindrome (21111233211112).

The spelling of 21000112111100 in words is "twenty-one trillion, one hundred twelve million, one hundred eleven thousand, one hundred".