21010112112220 has 96 divisors (see below), whose sum is σ = 55022309959680. Its totient is φ = 6546937751040.

The previous prime is 21010112112191. The next prime is 21010112112221. The reversal of 21010112112220 is 2221121101012.

It is a junction number, because it is equal to n+sod(n) for n = 21010112112194 and 21010112112203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010112112221) 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, 4314477 + ... + 7786843.

It is an arithmetic number, because the mean of its divisors is an integer number (573149062080).

Almost surely, 2^{21010112112220} is an apocalyptic number.

21010112112220 is a gapful number since it is divisible by the number (20) 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 21010112112220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27511154979840).

21010112112220 is an abundant number, since it is smaller than the sum of its proper divisors (34012197847460).

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

21010112112220 is a wasteful number, since it uses less digits than its factorization.

21010112112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3476323 (or 3476321 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21010112112220 its reverse (2221121101012), we get a palindrome (23231233213232).

It can be divided in two parts, 210101 and 12112220, that added together give a palindrome (12322321).

The spelling of 21010112112220 in words is "twenty-one trillion, ten billion, one hundred twelve million, one hundred twelve thousand, two hundred twenty".