12221121403220 has 12 divisors (see below), whose sum is σ = 25664354946804. Its totient is φ = 4888448561280.

The previous prime is 12221121403181. The next prime is 12221121403237. The reversal of 12221121403220 is 2230412112221.

It can be written as a sum of positive squares in 2 ways, for example, as 2877657605956 + 9343463797264 = 1696366^2 + 3056708^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305528035061 + ... + 305528035100.

It is an arithmetic number, because the mean of its divisors is an integer number (2138696245567).

Almost surely, 2^{12221121403220} is an apocalyptic number.

12221121403220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221121403220 is an abundant number, since it is smaller than the sum of its proper divisors (13443233543584).

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

12221121403220 is a wasteful number, since it uses less digits than its factorization.

12221121403220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611056070170 (or 611056070168 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 12221121403220 its reverse (2230412112221), we get a palindrome (14451533515441).

The spelling of 12221121403220 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty-one million, four hundred three thousand, two hundred twenty".