1221112210110 has 256 divisors, whose sum is σ = 3454699852800. Its totient is φ = 273508171776.

The previous prime is 1221112210099. The next prime is 1221112210169. The reversal of 1221112210110 is 110122111221.

It is a happy number.

It is a super-2 number, since 2×1221112210110² (a number of 25 digits) contains 22 as substring.

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 1221112210110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 41459049 + ... + 41488491.

It is an arithmetic number, because the mean of its divisors is an integer number (13494921300).

Almost surely, 2^{1221112210110} is an apocalyptic number.

1221112210110 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221112210110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1727349926400).

1221112210110 is an abundant number, since it is smaller than the sum of its proper divisors (2233587642690).

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

1221112210110 is a wasteful number, since it uses less digits than its factorization.

1221112210110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29707.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221112210110 its reverse (110122111221), we get a palindrome (1331234321331).

The spelling of 1221112210110 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred ten thousand, one hundred ten".