1321020320111 has 16 divisors (see below), whose sum is σ = 1404821975040. Its totient is φ = 1238695997760.

The previous prime is 1321020320083. The next prime is 1321020320129. The reversal of 1321020320111 is 1110230201231.

It is a cyclic number.

It is not a de Polignac number, because 1321020320111 - 2¹⁴ = 1321020303727 is a prime.

It is a super-2 number, since 2×1321020320111² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321020320111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321020320131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260411 + ... + 1646163.

It is an arithmetic number, because the mean of its divisors is an integer number (87801373440).

Almost surely, 2^{1321020320111} is an apocalyptic number.

1321020320111 is a deficient number, since it is larger than the sum of its proper divisors (83801654929).

1321020320111 is a wasteful number, since it uses less digits than its factorization.

1321020320111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1386286.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1321020320111 its reverse (1110230201231), we get a palindrome (2431250521342).

The spelling of 1321020320111 in words is "one trillion, three hundred twenty-one billion, twenty million, three hundred twenty thousand, one hundred eleven".