31121123321 has 8 divisors (see below), whose sum is σ = 34686082080. Its totient is φ = 27748865088.

The previous prime is 31121123309. The next prime is 31121123329. The reversal of 31121123321 is 12332112113.

It is a happy number.

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 31121123321 - 2¹⁰ = 31121122297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31121123293 and 31121123302.

It is not an unprimeable number, because it can be changed into a prime (31121123329) 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, 48174791 + ... + 48175436.

It is an arithmetic number, because the mean of its divisors is an integer number (4335760260).

Almost surely, 2^31121123321 is an apocalyptic number.

It is an amenable number.

31121123321 is a deficient number, since it is larger than the sum of its proper divisors (3564958759).

31121123321 is a wasteful number, since it uses less digits than its factorization.

31121123321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96350263.

The product of its digits is 216, while the sum is 20.

Adding to 31121123321 its reverse (12332112113), we get a palindrome (43453235434).

The spelling of 31121123321 in words is "thirty-one billion, one hundred twenty-one million, one hundred twenty-three thousand, three hundred twenty-one".