21013221011112 has 128 divisors (see below), whose sum is σ = 63719088048000. Its totient is φ = 6363376657920.

The previous prime is 21013221011063. The next prime is 21013221011137. The reversal of 21013221011112 is 21111012231012.

It is a happy number.

21013221011112 is a `hidden beast` number, since 210 + 1 + 322 + 10 + 11 + 112 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

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, 585564 + ... + 6509172.

It is an arithmetic number, because the mean of its divisors is an integer number (497805375375).

Almost surely, 2^{21013221011112} is an apocalyptic number.

21013221011112 is a gapful number since it is divisible by the number (22) 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 21013221011112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31859544024000).

21013221011112 is an abundant number, since it is smaller than the sum of its proper divisors (42705867036888).

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

21013221011112 is a wasteful number, since it uses less digits than its factorization.

21013221011112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5925128 (or 5925118 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

Adding to 21013221011112 its reverse (21111012231012), we get a palindrome (42124233242124).

The spelling of 21013221011112 in words is "twenty-one trillion, thirteen billion, two hundred twenty-one million, eleven thousand, one hundred twelve".