1311211320202 has 12 divisors (see below), whose sum is σ = 2287929956850. Its totient is φ = 561947708616.

The previous prime is 1311211320197. The next prime is 1311211320217. The reversal of 1311211320202 is 2020231121131.

It can be written as a sum of positive squares in only one way, i.e., 1309928319441 + 1283000761 = 1144521^2 + 35819^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1311211320202.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6689853577 + ... + 6689853772.

Almost surely, 2^{1311211320202} is an apocalyptic number.

1311211320202 is a deficient number, since it is larger than the sum of its proper divisors (976718636648).

1311211320202 is a wasteful number, since it uses less digits than its factorization.

1311211320202 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13379707365 (or 13379707358 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1311211320202 its reverse (2020231121131), we get a palindrome (3331442441333).

The spelling of 1311211320202 in words is "one trillion, three hundred eleven billion, two hundred eleven million, three hundred twenty thousand, two hundred two".