312643021442 has 4 divisors (see below), whose sum is σ = 468964532166. Its totient is φ = 156321510720.

The previous prime is 312643021441. The next prime is 312643021469. The reversal of 312643021442 is 244120346213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244120346213 = 3019 ⋅80861327.

It can be written as a sum of positive squares in only one way, i.e., 304559393161 + 8083628281 = 551869^2 + 89909^2 .

It is a junction number, because it is equal to n+sod(n) for n = 312643021399 and 312643021408.

It is not an unprimeable number, because it can be changed into a prime (312643021441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78160755359 + ... + 78160755362.

Almost surely, 2^312643021442 is an apocalyptic number.

312643021442 is a deficient number, since it is larger than the sum of its proper divisors (156321510724).

312643021442 is a wasteful number, since it uses less digits than its factorization.

312643021442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156321510723.

The product of its (nonzero) digits is 27648, while the sum is 32.

Adding to 312643021442 its reverse (244120346213), we get a palindrome (556763367655).

The spelling of 312643021442 in words is "three hundred twelve billion, six hundred forty-three million, twenty-one thousand, four hundred forty-two".