21201011112 has 128 divisors (see below), whose sum is σ = 55194048000. Its totient is φ = 6781378560.

The previous prime is 21201011087. The next prime is 21201011141. The reversal of 21201011112 is 21111010212.

It is a super-2 number, since 2×21201011112² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20404689 + ... + 20405727.

It is an arithmetic number, because the mean of its divisors is an integer number (431203500).

Almost surely, 2^21201011112 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 21201011112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27597024000).

21201011112 is an abundant number, since it is smaller than the sum of its proper divisors (33993036888).

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

21201011112 is a wasteful number, since it uses less digits than its factorization.

21201011112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1411 (or 1407 counting only the distinct ones).

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

Adding to 21201011112 its reverse (21111010212), we get a palindrome (42312021324).

The spelling of 21201011112 in words is "twenty-one billion, two hundred one million, eleven thousand, one hundred twelve".