1311020321011 has 4 divisors (see below), whose sum is σ = 1313348954472. Its totient is φ = 1308691687552.

The previous prime is 1311020320999. The next prime is 1311020321027. The reversal of 1311020321011 is 1101230201131.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1311020321011 - 2⁵ = 1311020320979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311020321041) 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, 1164315886 + ... + 1164317011.

It is an arithmetic number, because the mean of its divisors is an integer number (328337238618).

Almost surely, 2^{1311020321011} is an apocalyptic number.

1311020321011 is a deficient number, since it is larger than the sum of its proper divisors (2328633461).

1311020321011 is an equidigital number, since it uses as much as digits as its factorization.

1311020321011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2328633460.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1311020321011 its reverse (1101230201131), we get a palindrome (2412250522142).

The spelling of 1311020321011 in words is "one trillion, three hundred eleven billion, twenty million, three hundred twenty-one thousand, eleven".