21021020011112 has 128 divisors (see below), whose sum is σ = 44257299609600. Its totient is φ = 9276225235200.

The previous prime is 21021020011097. The next prime is 21021020011129. The reversal of 21021020011112 is 21111002012012.

It is a super-2 number, since 2×21021020011112² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6325914683 + ... + 6325918005.

It is an arithmetic number, because the mean of its divisors is an integer number (345760153200).

Almost surely, 2^{21021020011112} is an apocalyptic number.

21021020011112 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 21021020011112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22128649804800).

21021020011112 is an abundant number, since it is smaller than the sum of its proper divisors (23236279598488).

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

21021020011112 is a wasteful number, since it uses less digits than its factorization.

21021020011112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7087 (or 7083 counting only the distinct ones).

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

Adding to 21021020011112 its reverse (21111002012012), we get a palindrome (42132022023124).

Subtracting 21021020011112 from its reverse (21111002012012), we obtain a square (89982000900 = 299970²).

The spelling of 21021020011112 in words is "twenty-one trillion, twenty-one billion, twenty million, eleven thousand, one hundred twelve".