12221965855 has 16 divisors (see below), whose sum is σ = 16058723328. Its totient is φ = 8855892000.

The previous prime is 12221965823. The next prime is 12221965909. The reversal of 12221965855 is 55856912221.

It is not a de Polignac number, because 12221965855 - 2⁵ = 12221965823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 395091 + ... + 424900.

It is an arithmetic number, because the mean of its divisors is an integer number (1003670208).

Almost surely, 2^12221965855 is an apocalyptic number.

12221965855 is a deficient number, since it is larger than the sum of its proper divisors (3836757473).

12221965855 is a wasteful number, since it uses less digits than its factorization.

12221965855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820278.

The product of its digits is 432000, while the sum is 46.

Subtracting from 12221965855 its sum of digits (46), we obtain a square (12221965809 = 110553²).

The spelling of 12221965855 in words is "twelve billion, two hundred twenty-one million, nine hundred sixty-five thousand, eight hundred fifty-five".