12220121826 has 96 divisors (see below), whose sum is σ = 29797574976. Its totient is φ = 3587760000.

The previous prime is 12220121813. The next prime is 12220121839. The reversal of 12220121826 is 62812102221.

It is an interprime number because it is at equal distance from previous prime (12220121813) and next prime (12220121839).

It is a self number, because there is not a number n which added to its sum of digits gives 12220121826.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 801676 + ... + 816776.

It is an arithmetic number, because the mean of its divisors is an integer number (310391406).

Almost surely, 2^12220121826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12220121826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14898787488).

12220121826 is an abundant number, since it is smaller than the sum of its proper divisors (17577453150).

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

12220121826 is a wasteful number, since it uses less digits than its factorization.

12220121826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15248 (or 15245 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The spelling of 12220121826 in words is "twelve billion, two hundred twenty million, one hundred twenty-one thousand, eight hundred twenty-six".