312221020031 has 4 divisors (see below), whose sum is σ = 312224085000. Its totient is φ = 312217955064.

The previous prime is 312221020003. The next prime is 312221020049. The reversal of 312221020031 is 130020122213.

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

It is a cyclic number.

It is not a de Polignac number, because 312221020031 - 2³⁴ = 295041150847 is a prime.

It is a super-2 number, since 2×312221020031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312221019991 and 312221020009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312221023031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1374236 + ... + 1585233.

It is an arithmetic number, because the mean of its divisors is an integer number (78056021250).

Almost surely, 2^312221020031 is an apocalyptic number.

312221020031 is a deficient number, since it is larger than the sum of its proper divisors (3064969).

312221020031 is a wasteful number, since it uses less digits than its factorization.

312221020031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3064968.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 312221020031 its reverse (130020122213), we get a palindrome (442241142244).

The spelling of 312221020031 in words is "three hundred twelve billion, two hundred twenty-one million, twenty thousand, thirty-one".