21220110220 has 12 divisors (see below), whose sum is σ = 44562231504. Its totient is φ = 8488044080.

The previous prime is 21220110217. The next prime is 21220110253. The reversal of 21220110220 is 2201102212.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21220110220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530502736 + ... + 530502775.

It is an arithmetic number, because the mean of its divisors is an integer number (3713519292).

Almost surely, 2^21220110220 is an apocalyptic number.

21220110220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21220110220 is an abundant number, since it is smaller than the sum of its proper divisors (23342121284).

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

21220110220 is a wasteful number, since it uses less digits than its factorization.

21220110220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061005520 (or 1061005518 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21220110220 its reverse (2201102212), we get a palindrome (23421212432).

The spelling of 21220110220 in words is "twenty-one billion, two hundred twenty million, one hundred ten thousand, two hundred twenty".