3121312021321 has 8 divisors (see below), whose sum is σ = 3394048024640. Its totient is φ = 2853238172112.

The previous prime is 3121312021309. The next prime is 3121312021327. The reversal of 3121312021321 is 1231202131213.

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 3121312021321 - 2³¹ = 3119164537673 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3121312021292 and 3121312021301.

It is not an unprimeable number, because it can be changed into a prime (3121312021327) 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, 1165537131 + ... + 1165539808.

It is an arithmetic number, because the mean of its divisors is an integer number (424256003080).

Almost surely, 2^{3121312021321} is an apocalyptic number.

It is an amenable number.

3121312021321 is a deficient number, since it is larger than the sum of its proper divisors (272736003319).

3121312021321 is a wasteful number, since it uses less digits than its factorization.

3121312021321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331077055.

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

Adding to 3121312021321 its reverse (1231202131213), we get a palindrome (4352514152534).

The spelling of 3121312021321 in words is "three trillion, one hundred twenty-one billion, three hundred twelve million, twenty-one thousand, three hundred twenty-one".