1321000011311 has 4 divisors (see below), whose sum is σ = 1353219523824. Its totient is φ = 1288780498800.

The previous prime is 1321000011307. The next prime is 1321000011347. The reversal of 1321000011311 is 1131100001231.

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 1321000011311 - 2² = 1321000011307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321000011301) 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, 16109756195 + ... + 16109756276.

It is an arithmetic number, because the mean of its divisors is an integer number (338304880956).

Almost surely, 2^{1321000011311} is an apocalyptic number.

1321000011311 is a deficient number, since it is larger than the sum of its proper divisors (32219512513).

1321000011311 is an equidigital number, since it uses as much as digits as its factorization.

1321000011311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32219512512.

The product of its (nonzero) digits is 18, while the sum is 14.

Adding to 1321000011311 its reverse (1131100001231), we get a palindrome (2452100012542).

The spelling of 1321000011311 in words is "one trillion, three hundred twenty-one billion, eleven thousand, three hundred eleven".