312211221123 has 4 divisors (see below), whose sum is σ = 416281628168. Its totient is φ = 208140814080.

The previous prime is 312211221043. The next prime is 312211221143. The reversal of 312211221123 is 321122112213.

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

It is not a de Polignac number, because 312211221123 - 2¹² = 312211217027 is a prime.

It is a super-2 number, since 2×312211221123² (a number of 24 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 312211221123.

It is not an unprimeable number, because it can be changed into a prime (312211221143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52035203518 + ... + 52035203523.

It is an arithmetic number, because the mean of its divisors is an integer number (104070407042).

Almost surely, 2^312211221123 is an apocalyptic number.

312211221123 is a deficient number, since it is larger than the sum of its proper divisors (104070407045).

312211221123 is a wasteful number, since it uses less digits than its factorization.

312211221123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104070407044.

The product of its digits is 288, while the sum is 21.

Adding to 312211221123 its reverse (321122112213), we get a palindrome (633333333336).

The spelling of 312211221123 in words is "three hundred twelve billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-three".