221111212120110 has 192 divisors, whose sum is σ = 639573336170496. Its totient is φ = 52631218886400.

The previous prime is 221111212120109. The next prime is 221111212120129. The reversal of 221111212120110 is 11021212111122.

It is a happy number.

221111212120110 is a `hidden beast` number, since 2 + 211 + 11 + 212 + 120 + 110 = 666.

It is a super-2 number, since 2×221111212120110² (a number of 29 digits) contains 22 as substring.

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 95 ways as a sum of consecutive naturals, for example, 44920495 + ... + 49599125.

It is an arithmetic number, because the mean of its divisors is an integer number (3331111125888).

Almost surely, 2^{221111212120110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221111212120110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319786668085248).

221111212120110 is an abundant number, since it is smaller than the sum of its proper divisors (418462124050386).

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

221111212120110 is a wasteful number, since it uses less digits than its factorization.

221111212120110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4679991 (or 4679988 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221111212120110 its reverse (11021212111122), we get a palindrome (232132424231232).

The spelling of 221111212120110 in words is "two hundred twenty-one trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty thousand, one hundred ten".