21112222220000 has 240 divisors, whose sum is σ = 52613161524000. Its totient is φ = 8335641600000.

The previous prime is 21112222219997. The next prime is 21112222220041. The reversal of 21112222220000 is 2222221112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1066210100 + ... + 1066229900.

It is an arithmetic number, because the mean of its divisors is an integer number (219221506350).

Almost surely, 2^{21112222220000} is an apocalyptic number.

21112222220000 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 21112222220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26306580762000).

21112222220000 is an abundant number, since it is smaller than the sum of its proper divisors (31500939304000).

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

21112222220000 is an equidigital number, since it uses as much as digits as its factorization.

21112222220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20519 (or 20496 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21112222220000 its reverse (2222221112), we get a palindrome (21114444441112).

The spelling of 21112222220000 in words is "twenty-one trillion, one hundred twelve billion, two hundred twenty-two million, two hundred twenty thousand".