12211311985 has 4 divisors (see below), whose sum is σ = 14653574388. Its totient is φ = 9769049584.

The previous prime is 12211311947. The next prime is 12211312019. The reversal of 12211311985 is 58911311221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4144398129 + 8066913856 = 64377^2 + 89816^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211311985 - 2⁷ = 12211311857 is a prime.

It is a super-2 number, since 2×12211311985² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12211311985.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1221131194 + ... + 1221131203.

It is an arithmetic number, because the mean of its divisors is an integer number (3663393597).

Almost surely, 2^12211311985 is an apocalyptic number.

It is an amenable number.

12211311985 is a deficient number, since it is larger than the sum of its proper divisors (2442262403).

12211311985 is an equidigital number, since it uses as much as digits as its factorization.

12211311985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442262402.

The product of its digits is 4320, while the sum is 34.

The spelling of 12211311985 in words is "twelve billion, two hundred eleven million, three hundred eleven thousand, nine hundred eighty-five".