21112220111000 has 128 divisors (see below), whose sum is σ = 49622582880000. Its totient is φ = 8407302400000.

The previous prime is 21112220110963. The next prime is 21112220111023. The reversal of 21112220111000 is 11102221112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1111101500 + ... + 1111120500.

It is an arithmetic number, because the mean of its divisors is an integer number (387676428750).

Almost surely, 2^{21112220111000} is an apocalyptic number.

21112220111000 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 21112220111000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24811291440000).

21112220111000 is an abundant number, since it is smaller than the sum of its proper divisors (28510362769000).

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

21112220111000 is a wasteful number, since it uses less digits than its factorization.

21112220111000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23910 (or 23896 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21112220111000 its reverse (11102221112), we get a palindrome (21123322332112).

The spelling of 21112220111000 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty million, one hundred eleven thousand".