21110120220210 has 64 divisors (see below), whose sum is σ = 57904076454912. Its totient is φ = 4825000967616.

The previous prime is 21110120220197. The next prime is 21110120220251. The reversal of 21110120220210 is 1202202101112.

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 21110120220210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4281937 + ... + 7781723.

It is an arithmetic number, because the mean of its divisors is an integer number (904751194608).

Almost surely, 2^{21110120220210} is an apocalyptic number.

21110120220210 is an abundant number, since it is smaller than the sum of its proper divisors (36793956234702).

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

21110120220210 is a wasteful number, since it uses less digits than its factorization.

21110120220210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3528527.

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

Adding to 21110120220210 its reverse (1202202101112), we get a palindrome (22312322321322).

The spelling of 21110120220210 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty million, two hundred twenty thousand, two hundred ten".