312111333221 has 4 divisors (see below), whose sum is σ = 312174099372. Its totient is φ = 312048567072.

The previous prime is 312111333211. The next prime is 312111333229. The reversal of 312111333221 is 122333111213.

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 182060942596 + 130050390625 = 426686^2 + 360625^2 .

It is a cyclic number.

It is not a de Polignac number, because 312111333221 - 2¹⁴ = 312111316837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312111333229) 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, 31375616 + ... + 31385561.

It is an arithmetic number, because the mean of its divisors is an integer number (78043524843).

Almost surely, 2^312111333221 is an apocalyptic number.

It is an amenable number.

312111333221 is a deficient number, since it is larger than the sum of its proper divisors (62766151).

312111333221 is an equidigital number, since it uses as much as digits as its factorization.

312111333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62766150.

The product of its digits is 648, while the sum is 23.

Adding to 312111333221 its reverse (122333111213), we get a palindrome (434444444434).

The spelling of 312111333221 in words is "three hundred twelve billion, one hundred eleven million, three hundred thirty-three thousand, two hundred twenty-one".