21112110100220 has 24 divisors (see below), whose sum is σ = 45086879199600. Its totient is φ = 8301711089792.

The previous prime is 21112110100219. The next prime is 21112110100229. The reversal of 21112110100220 is 2200101121112.

It is a super-2 number, since 2×21112110100220² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21112110100195 and 21112110100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112110100229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8945808185 + ... + 8945810544.

It is an arithmetic number, because the mean of its divisors is an integer number (1878619966650).

Almost surely, 2^{21112110100220} is an apocalyptic number.

21112110100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112110100220 is an abundant number, since it is smaller than the sum of its proper divisors (23974769099380).

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

21112110100220 is a wasteful number, since it uses less digits than its factorization.

21112110100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17891618797 (or 17891618795 counting only the distinct ones).

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

Adding to 21112110100220 its reverse (2200101121112), we get a palindrome (23312211221332).

The spelling of 21112110100220 in words is "twenty-one trillion, one hundred twelve billion, one hundred ten million, one hundred thousand, two hundred twenty".