21112111101220 has 24 divisors (see below), whose sum is σ = 44336138817600. Its totient is φ = 8444710058592.

The previous prime is 21112111101187. The next prime is 21112111101227. The reversal of 21112111101220 is 2210111121112.

It is a super-2 number, since 2×21112111101220² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21112111101194 and 21112111101203.

It is not an unprimeable number, because it can be changed into a prime (21112111101227) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7105750 + ... + 9628909.

It is an arithmetic number, because the mean of its divisors is an integer number (1847339117400).

Almost surely, 2^{21112111101220} is an apocalyptic number.

21112111101220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112111101220 is an abundant number, since it is smaller than the sum of its proper divisors (23224027716380).

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

21112111101220 is a wasteful number, since it uses less digits than its factorization.

21112111101220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16797747 (or 16797745 counting only the distinct ones).

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

Adding to 21112111101220 its reverse (2210111121112), we get a palindrome (23322222222332).

The spelling of 21112111101220 in words is "twenty-one trillion, one hundred twelve billion, one hundred eleven million, one hundred one thousand, two hundred twenty".