312221213131 has 4 divisors (see below), whose sum is σ = 312222652272. Its totient is φ = 312219773992.

The previous prime is 312221213111. The next prime is 312221213153. The reversal of 312221213131 is 131312122213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131312122213 = 19 ⋅6911164327.

It is a cyclic number.

It is not a de Polignac number, because 312221213131 - 2¹¹ = 312221211083 is a prime.

It is a super-2 number, since 2×312221213131² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312221213111) 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 in 3 ways as a sum of consecutive naturals, for example, 320296 + ... + 852661.

It is an arithmetic number, because the mean of its divisors is an integer number (78055663068).

Almost surely, 2^312221213131 is an apocalyptic number.

312221213131 is a deficient number, since it is larger than the sum of its proper divisors (1439141).

312221213131 is a wasteful number, since it uses less digits than its factorization.

312221213131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1439140.

The product of its digits is 432, while the sum is 22.

Adding to 312221213131 its reverse (131312122213), we get a palindrome (443533335344).

The spelling of 312221213131 in words is "three hundred twelve billion, two hundred twenty-one million, two hundred thirteen thousand, one hundred thirty-one".