1311230134221 has 16 divisors (see below), whose sum is σ = 2001613945344. Its totient is φ = 747943495344.

The previous prime is 1311230134219. The next prime is 1311230134229. The reversal of 1311230134221 is 1224310321131.

It is not a de Polignac number, because 1311230134221 - 2¹ = 1311230134219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311230134191 and 1311230134200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311230134229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55440691 + ... + 55464336.

It is an arithmetic number, because the mean of its divisors is an integer number (125100871584).

Almost surely, 2^{1311230134221} is an apocalyptic number.

It is an amenable number.

1311230134221 is a deficient number, since it is larger than the sum of its proper divisors (690383811123).

1311230134221 is a wasteful number, since it uses less digits than its factorization.

1311230134221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110905600.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 1311230134221 its reverse (1224310321131), we get a palindrome (2535540455352).

The spelling of 1311230134221 in words is "one trillion, three hundred eleven billion, two hundred thirty million, one hundred thirty-four thousand, two hundred twenty-one".