21110211112220 has 192 divisors, whose sum is σ = 46183776038400. Its totient is φ = 8101661368320.

The previous prime is 21110211112213. The next prime is 21110211112253. The reversal of 21110211112220 is 2221111201112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2275538222 + ... + 2275547498.

It is an arithmetic number, because the mean of its divisors is an integer number (240540500200).

Almost surely, 2^{21110211112220} is an apocalyptic number.

21110211112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21110211112220 is an abundant number, since it is smaller than the sum of its proper divisors (25073564926180).

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

21110211112220 is a wasteful number, since it uses less digits than its factorization.

21110211112220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9728 (or 9726 counting only the distinct ones).

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

Adding to 21110211112220 its reverse (2221111201112), we get a palindrome (23331322313332).

The spelling of 21110211112220 in words is "twenty-one trillion, one hundred ten billion, two hundred eleven million, one hundred twelve thousand, two hundred twenty".