312111112421 has 4 divisors (see below), whose sum is σ = 312113214732. Its totient is φ = 312109010112.

The previous prime is 312111112399. The next prime is 312111112507. The reversal of 312111112421 is 124211111213.

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 134270944900 + 177840167521 = 366430^2 + 421711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-312111112421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312111112393 and 312111112402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312111112721) 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, 810026 + ... + 1131531.

It is an arithmetic number, because the mean of its divisors is an integer number (78028303683).

Almost surely, 2^312111112421 is an apocalyptic number.

It is an amenable number.

312111112421 is a deficient number, since it is larger than the sum of its proper divisors (2102311).

312111112421 is a wasteful number, since it uses less digits than its factorization.

312111112421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102310.

The product of its digits is 96, while the sum is 20.

Adding to 312111112421 its reverse (124211111213), we get a palindrome (436322223634).

The spelling of 312111112421 in words is "three hundred twelve billion, one hundred eleven million, one hundred twelve thousand, four hundred twenty-one".