1312100123321 has 4 divisors (see below), whose sum is σ = 1413030902052. Its totient is φ = 1211169344592.

The previous prime is 1312100123309. The next prime is 1312100123363. The reversal of 1312100123321 is 1233210012131.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 404796247696 + 907303875625 = 636236^2 + 952525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312100123321 - 2³⁴ = 1294920254137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312100123293 and 1312100123302.

It is not an unprimeable number, because it can be changed into a prime (1312100123821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50465389346 + ... + 50465389371.

It is an arithmetic number, because the mean of its divisors is an integer number (353257725513).

Almost surely, 2^{1312100123321} is an apocalyptic number.

It is an amenable number.

1312100123321 is a deficient number, since it is larger than the sum of its proper divisors (100930778731).

1312100123321 is a wasteful number, since it uses less digits than its factorization.

1312100123321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100930778730.

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

Adding to 1312100123321 its reverse (1233210012131), we get a palindrome (2545310135452).

The spelling of 1312100123321 in words is "one trillion, three hundred twelve billion, one hundred million, one hundred twenty-three thousand, three hundred twenty-one".