21110111000000 has 392 divisors, whose sum is σ = 57691114981776. Its totient is φ = 7600000000000.

The previous prime is 21110110999931. The next prime is 21110111000021. The reversal of 21110111000000 is 11101112.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1110990500 + ... + 1111009500.

Almost surely, 2^{21110111000000} is an apocalyptic number.

21110111000000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110111000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28845557490888).

21110111000000 is an abundant number, since it is smaller than the sum of its proper divisors (36581003981776).

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

21110111000000 is an equidigital number, since it uses as much as digits as its factorization.

21110111000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19155 (or 19120 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 8.

Adding to 21110111000000 its reverse (11101112), we get a palindrome (21110122101112).

The spelling of 21110111000000 in words is "twenty-one trillion, one hundred ten billion, one hundred eleven million", and thus it is an aban number.