21220101111220 has 96 divisors (see below), whose sum is σ = 49424492880000. Its totient is φ = 7587716083200.

The previous prime is 21220101111203. The next prime is 21220101111257. The reversal of 21220101111220 is 2211110102212.

21220101111220 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 21220101111194 and 21220101111203.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 46730626 + ... + 47182534.

It is an arithmetic number, because the mean of its divisors is an integer number (514838467500).

Almost surely, 2^{21220101111220} is an apocalyptic number.

21220101111220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220101111220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24712246440000).

21220101111220 is an abundant number, since it is smaller than the sum of its proper divisors (28204391768780).

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

21220101111220 is a wasteful number, since it uses less digits than its factorization.

21220101111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455489 (or 455487 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21220101111220 its reverse (2211110102212), we get a palindrome (23431211213432).

The spelling of 21220101111220 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, one hundred eleven thousand, two hundred twenty".