21111200112 has 80 divisors (see below), whose sum is σ = 56114435232. Its totient is φ = 6834263040.

The previous prime is 21111200101. The next prime is 21111200153. The reversal of 21111200112 is 21100211112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 978562 + ... + 999902.

Almost surely, 2^21111200112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111200112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28057217616).

21111200112 is an abundant number, since it is smaller than the sum of its proper divisors (35003235120).

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

21111200112 is a wasteful number, since it uses less digits than its factorization.

21111200112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21946 (or 21940 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21111200112 its reverse (21100211112), we get a palindrome (42211411224).

It can be divided in two parts, 211 and 11200112, that multiplied together give a palindrome (2363223632).

The spelling of 21111200112 in words is "twenty-one billion, one hundred eleven million, two hundred thousand, one hundred twelve".