12221203122 has 24 divisors (see below), whose sum is σ = 26536730220. Its totient is φ = 4064894880.

The previous prime is 12221203097. The next prime is 12221203177. The reversal of 12221203122 is 22130212221.

It can be written as a sum of positive squares in 2 ways, for example, as 10704178521 + 1517024601 = 103461^2 + 38949^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 12221203095 and 12221203104.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 728097 + ... + 744692.

Almost surely, 2^12221203122 is an apocalyptic number.

12221203122 is an abundant number, since it is smaller than the sum of its proper divisors (14315527098).

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

12221203122 is a wasteful number, since it uses less digits than its factorization.

12221203122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473258 (or 1473255 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12221203122 its reverse (22130212221), we get a palindrome (34351415343).

Subtracting 12221203122 from its reverse (22130212221), we obtain a palindrome (9909009099).

The spelling of 12221203122 in words is "twelve billion, two hundred twenty-one million, two hundred three thousand, one hundred twenty-two".