1320891220011 has 16 divisors (see below), whose sum is σ = 1973223249408. Its totient is φ = 778903912800.

The previous prime is 1320891220009. The next prime is 1320891220037. The reversal of 1320891220011 is 1100221980231.

It is not a de Polignac number, because 1320891220011 - 2¹ = 1320891220009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1320891220001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 540904275 + ... + 540906716.

It is an arithmetic number, because the mean of its divisors is an integer number (123326453088).

Almost surely, 2^{1320891220011} is an apocalyptic number.

1320891220011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1320891220011 is a deficient number, since it is larger than the sum of its proper divisors (652332029397).

1320891220011 is a wasteful number, since it uses less digits than its factorization.

1320891220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081811042.

The product of its (nonzero) digits is 1728, while the sum is 30.

It can be divided in two parts, 13208 and 91220011, that added together give a palindrome (91233219).

The spelling of 1320891220011 in words is "one trillion, three hundred twenty billion, eight hundred ninety-one million, two hundred twenty thousand, eleven".