312111022211 has 4 divisors (see below), whose sum is σ = 312114623424. Its totient is φ = 312107421000.

The previous prime is 312111022129. The next prime is 312111022213. The reversal of 312111022211 is 112220111213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112220111213 = 7 ⋅16031444459.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312111022211 is a prime.

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 312111022211.

It is not an unprimeable number, because it can be changed into a prime (312111022213) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1667315 + ... + 1845036.

It is an arithmetic number, because the mean of its divisors is an integer number (78028655856).

Almost surely, 2^312111022211 is an apocalyptic number.

312111022211 is a deficient number, since it is larger than the sum of its proper divisors (3601213).

312111022211 is an equidigital number, since it uses as much as digits as its factorization.

312111022211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601212.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 312111022211 its reverse (112220111213), we get a palindrome (424331133424).

The spelling of 312111022211 in words is "three hundred twelve billion, one hundred eleven million, twenty-two thousand, two hundred eleven".