1311211343402 has 4 divisors (see below), whose sum is σ = 1966817015106. Its totient is φ = 655605671700.

The previous prime is 1311211343353. The next prime is 1311211343513. The reversal of 1311211343402 is 2043431121131.

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

It can be written as a sum of positive squares in only one way, i.e., 955684163281 + 355527180121 = 977591^2 + 596261^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327802835849 + ... + 327802835852.

Almost surely, 2^{1311211343402} is an apocalyptic number.

1311211343402 is a deficient number, since it is larger than the sum of its proper divisors (655605671704).

1311211343402 is an equidigital number, since it uses as much as digits as its factorization.

1311211343402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655605671703.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 1311211343402 its reverse (2043431121131), we get a palindrome (3354642464533).

The spelling of 1311211343402 in words is "one trillion, three hundred eleven billion, two hundred eleven million, three hundred forty-three thousand, four hundred two".