21120212002110 has 128 divisors (see below), whose sum is σ = 54932496675840. Its totient is φ = 5166037426176.

The previous prime is 21120212002093. The next prime is 21120212002133. The reversal of 21120212002110 is 1120021202112.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21120212002110.

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, 66606321 + ... + 66922659.

It is an arithmetic number, because the mean of its divisors is an integer number (429160130280).

Almost surely, 2^{21120212002110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21120212002110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27466248337920).

21120212002110 is an abundant number, since it is smaller than the sum of its proper divisors (33812284673730).

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

21120212002110 is a wasteful number, since it uses less digits than its factorization.

21120212002110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317442.

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

Adding to 21120212002110 its reverse (1120021202112), we get a palindrome (22240233204222).

The spelling of 21120212002110 in words is "twenty-one trillion, one hundred twenty billion, two hundred twelve million, two thousand, one hundred ten".