21101110220 has 12 divisors (see below), whose sum is σ = 44312331504. Its totient is φ = 8440444080.

The previous prime is 21101110207. The next prime is 21101110237. The reversal of 21101110220 is 2201110112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527527736 + ... + 527527775.

It is an arithmetic number, because the mean of its divisors is an integer number (3692694292).

Almost surely, 2^21101110220 is an apocalyptic number.

21101110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101110220 is an abundant number, since it is smaller than the sum of its proper divisors (23211221284).

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

21101110220 is a wasteful number, since it uses less digits than its factorization.

21101110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055055520 (or 1055055518 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21101110220 its reverse (2201110112), we get a palindrome (23302220332).

The spelling of 21101110220 in words is "twenty-one billion, one hundred one million, one hundred ten thousand, two hundred twenty".