12221811278969 has 4 divisors (see below), whose sum is σ = 12222801472896. Its totient is φ = 12220821085044.

The previous prime is 12221811278947. The next prime is 12221811278987. The reversal of 12221811278969 is 96987211812221.

12221811278969 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12221811278969 - 2¹⁶ = 12221811213433 is a prime.

It is a super-2 number, since 2×12221811278969² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12221811278669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495078449 + ... + 495103134.

It is an arithmetic number, because the mean of its divisors is an integer number (3055700368224).

Almost surely, 2^{12221811278969} is an apocalyptic number.

It is an amenable number.

12221811278969 is a deficient number, since it is larger than the sum of its proper divisors (990193927).

12221811278969 is an equidigital number, since it uses as much as digits as its factorization.

12221811278969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990193926.

The product of its digits is 3483648, while the sum is 59.

The spelling of 12221811278969 in words is "twelve trillion, two hundred twenty-one billion, eight hundred eleven million, two hundred seventy-eight thousand, nine hundred sixty-nine".