12122221110 has 64 divisors (see below), whose sum is σ = 31008904704. Its totient is φ = 3022272000.

The previous prime is 12122221063. The next prime is 12122221147. The reversal of 12122221110 is 1112222121.

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 12122221110.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1696 + ... + 155715.

It is an arithmetic number, because the mean of its divisors is an integer number (484514136).

Almost surely, 2^12122221110 is an apocalyptic number.

12122221110 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 12122221110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15504452352).

12122221110 is an abundant number, since it is smaller than the sum of its proper divisors (18886683594).

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

12122221110 is a wasteful number, since it uses less digits than its factorization.

12122221110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157589.

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

Adding to 12122221110 its reverse (1112222121), we get a palindrome (13234443231).

The spelling of 12122221110 in words is "twelve billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred ten".