1312213210001 has 4 divisors (see below), whose sum is σ = 1389402222372. Its totient is φ = 1235024197632.

The previous prime is 1312213209973. The next prime is 1312213210019. The reversal of 1312213210001 is 1000123122131.

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 857937210001 + 454276000000 = 926249^2 + 674000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312213210001 is a prime.

It is a super-2 number, since 2×1312213210001² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 77189012353 = 1312213210001 / (1 + 3 + 1 + 2 + 2 + 1 + 3 + 2 + 1 + 0 + 0 + 0 + 1).

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1312213210031) 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, 38594506160 + ... + 38594506193.

It is an arithmetic number, because the mean of its divisors is an integer number (347350555593).

Almost surely, 2^{1312213210001} is an apocalyptic number.

It is an amenable number.

1312213210001 is a deficient number, since it is larger than the sum of its proper divisors (77189012371).

1312213210001 is an equidigital number, since it uses as much as digits as its factorization.

1312213210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77189012370.

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

Adding to 1312213210001 its reverse (1000123122131), we get a palindrome (2312336332132).

The spelling of 1312213210001 in words is "one trillion, three hundred twelve billion, two hundred thirteen million, two hundred ten thousand, one".