21111010110210 has 192 divisors, whose sum is σ = 54053502142464. Its totient is φ = 5275701120000.

The previous prime is 21111010110191. The next prime is 21111010110293. The reversal of 21111010110210 is 1201101011112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4443485335 + ... + 4443490085.

It is an arithmetic number, because the mean of its divisors is an integer number (281528656992).

Almost surely, 2^{21111010110210} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21111010110210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27026751071232).

21111010110210 is an abundant number, since it is smaller than the sum of its proper divisors (32942492032254).

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

21111010110210 is a wasteful number, since it uses less digits than its factorization.

21111010110210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6889 (or 6872 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21111010110210 its reverse (1201101011112), we get a palindrome (22312111121322).

The spelling of 21111010110210 in words is "twenty-one trillion, one hundred eleven billion, ten million, one hundred ten thousand, two hundred ten".