221312310031 has 4 divisors (see below), whose sum is σ = 222238303200. Its totient is φ = 220386316864.

The previous prime is 221312310013. The next prime is 221312310047. The reversal of 221312310031 is 130013213122.

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 221312310031 - 2⁷ = 221312309903 is a prime.

It is a super-2 number, since 2×221312310031² (a number of 23 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 = 221312309990 and 221312310008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221312310071) 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, 462996226 + ... + 462996703.

It is an arithmetic number, because the mean of its divisors is an integer number (55559575800).

Almost surely, 2^221312310031 is an apocalyptic number.

221312310031 is a deficient number, since it is larger than the sum of its proper divisors (925993169).

221312310031 is an equidigital number, since it uses as much as digits as its factorization.

221312310031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925993168.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 221312310031 its reverse (130013213122), we get a palindrome (351325523153).

The spelling of 221312310031 in words is "two hundred twenty-one billion, three hundred twelve million, three hundred ten thousand, thirty-one".