1312122100013 has 4 divisors (see below), whose sum is σ = 1312194703260. Its totient is φ = 1312049496768.

The previous prime is 1312122100001. The next prime is 1312122100019. The reversal of 1312122100013 is 3100012212131.

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 1035432423844 + 276689676169 = 1017562^2 + 526013^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312122100013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1312122099964 and 1312122100000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312122100019) 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, 36274508 + ... + 36310661.

It is an arithmetic number, because the mean of its divisors is an integer number (328048675815).

Almost surely, 2^{1312122100013} is an apocalyptic number.

It is an amenable number.

1312122100013 is a deficient number, since it is larger than the sum of its proper divisors (72603247).

1312122100013 is an equidigital number, since it uses as much as digits as its factorization.

1312122100013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72603246.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1312122100013 its reverse (3100012212131), we get a palindrome (4412134312144).

The spelling of 1312122100013 in words is "one trillion, three hundred twelve billion, one hundred twenty-two million, one hundred thousand, thirteen".