21020020001112 has 128 divisors (see below), whose sum is σ = 57930759256320. Its totient is φ = 6302733120000.

The previous prime is 21020020001053. The next prime is 21020020001117. The reversal of 21020020001112 is 21110002002012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020020001117) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42979183 + ... + 43465505.

It is an arithmetic number, because the mean of its divisors is an integer number (452584056690).

Almost surely, 2^{21020020001112} is an apocalyptic number.

21020020001112 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 21020020001112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28965379628160).

21020020001112 is an abundant number, since it is smaller than the sum of its proper divisors (36910739255208).

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

21020020001112 is a wasteful number, since it uses less digits than its factorization.

21020020001112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488065 (or 488061 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21020020001112 its reverse (21110002002012), we get a palindrome (42130022003124).

Subtracting 21020020001112 from its reverse (21110002002012), we obtain a square (89982000900 = 299970²).

The spelling of 21020020001112 in words is "twenty-one trillion, twenty billion, twenty million, one thousand, one hundred twelve".