21120212020110 has 128 divisors (see below), whose sum is σ = 58064080158720. Its totient is φ = 4816288273536.

The previous prime is 21120212020097. The next prime is 21120212020121. The reversal of 21120212020110 is 1102021202112.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21120212020110.

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, 279259881 + ... + 279335499.

It is an arithmetic number, because the mean of its divisors is an integer number (453625626240).

Almost surely, 2^{21120212020110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120212020110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29032040079360).

21120212020110 is an abundant number, since it is smaller than the sum of its proper divisors (36943868138610).

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

21120212020110 is a wasteful number, since it uses less digits than its factorization.

21120212020110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78702.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21120212020110 its reverse (1102021202112), we get a palindrome (22222233222222).

The spelling of 21120212020110 in words is "twenty-one trillion, one hundred twenty billion, two hundred twelve million, twenty thousand, one hundred ten".