21011122222110 has 32 divisors (see below), whose sum is σ = 56029659259680. Its totient is φ = 5602965925824.

The previous prime is 21011122222061. The next prime is 21011122222121. The reversal of 21011122222110 is 1122222111012.

21011122222110 is a `hidden beast` number, since 210 + 1 + 1 + 1 + 222 + 221 + 10 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38909485327 + ... + 38909485866.

It is an arithmetic number, because the mean of its divisors is an integer number (1750926851865).

Almost surely, 2^{21011122222110} is an apocalyptic number.

21011122222110 is an abundant number, since it is smaller than the sum of its proper divisors (35018537037570).

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

21011122222110 is a wasteful number, since it uses less digits than its factorization.

21011122222110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77818971209 (or 77818971203 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21011122222110 its reverse (1122222111012), we get a palindrome (22133344333122).

The spelling of 21011122222110 in words is "twenty-one trillion, eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, one hundred ten".