1031312112221 has 8 divisors (see below), whose sum is σ = 1045549514880. Its totient is φ = 1017104280192.

The previous prime is 1031312112203. The next prime is 1031312112301. The reversal of 1031312112221 is 1222112131301.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1031312112221 - 2¹⁸ = 1031311850077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1031312112193 and 1031312112202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031312115221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7322420 + ... + 7461933.

It is an arithmetic number, because the mean of its divisors is an integer number (130693689360).

Almost surely, 2^{1031312112221} is an apocalyptic number.

It is an amenable number.

1031312112221 is a deficient number, since it is larger than the sum of its proper divisors (14237402659).

1031312112221 is an equidigital number, since it uses as much as digits as its factorization.

1031312112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14785315.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1031312112221 its reverse (1222112131301), we get a palindrome (2253424243522).

The spelling of 1031312112221 in words is "one trillion, thirty-one billion, three hundred twelve million, one hundred twelve thousand, two hundred twenty-one".