21110110012220 has 24 divisors (see below), whose sum is σ = 44770154109408. Its totient is φ = 8360439608000.

The previous prime is 21110110012219. The next prime is 21110110012253. The reversal of 21110110012220 is 2221001101112.

It is a junction number, because it is equal to n+sod(n) for n = 21110110012195 and 21110110012204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5225272736 + ... + 5225276775.

It is an arithmetic number, because the mean of its divisors is an integer number (1865423087892).

Almost surely, 2^{21110110012220} is an apocalyptic number.

21110110012220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110110012220 is an abundant number, since it is smaller than the sum of its proper divisors (23660044097188).

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

21110110012220 is a wasteful number, since it uses less digits than its factorization.

21110110012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10450549621 (or 10450549619 counting only the distinct ones).

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

Adding to 21110110012220 its reverse (2221001101112), we get a palindrome (23331111113332).

The spelling of 21110110012220 in words is "twenty-one trillion, one hundred ten billion, one hundred ten million, twelve thousand, two hundred twenty".