21112211110220 has 12 divisors (see below), whose sum is σ = 44335643331504. Its totient is φ = 8444884444080.

The previous prime is 21112211110171. The next prime is 21112211110223. The reversal of 21112211110220 is 2201111221112.

It is not an unprimeable number, because it can be changed into a prime (21112211110223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527805277736 + ... + 527805277775.

It is an arithmetic number, because the mean of its divisors is an integer number (3694636944292).

Almost surely, 2^{21112211110220} is an apocalyptic number.

21112211110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112211110220 is an abundant number, since it is smaller than the sum of its proper divisors (23223432221284).

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

21112211110220 is a wasteful number, since it uses less digits than its factorization.

21112211110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055610555520 (or 1055610555518 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21112211110220 its reverse (2201111221112), we get a palindrome (23313322331332).

The spelling of 21112211110220 in words is "twenty-one trillion, one hundred twelve billion, two hundred eleven million, one hundred ten thousand, two hundred twenty".