1321201311123 has 16 divisors (see below), whose sum is σ = 1818577898496. Its totient is φ = 852317495520.

The previous prime is 1321201311083. The next prime is 1321201311127. The reversal of 1321201311123 is 3211131021231.

It is not a de Polignac number, because 1321201311123 - 2¹⁶ = 1321201245587 is a prime.

It is a super-2 number, since 2×1321201311123² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321201311123.

It is not an unprimeable number, because it can be changed into a prime (1321201311127) 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, 556165 + ... + 1718057.

It is an arithmetic number, because the mean of its divisors is an integer number (113661118656).

Almost surely, 2^{1321201311123} is an apocalyptic number.

1321201311123 is a deficient number, since it is larger than the sum of its proper divisors (497376587373).

1321201311123 is a wasteful number, since it uses less digits than its factorization.

1321201311123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174154.

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 1321201311123 its reverse (3211131021231), we get a palindrome (4532332332354).

The spelling of 1321201311123 in words is "one trillion, three hundred twenty-one billion, two hundred one million, three hundred eleven thousand, one hundred twenty-three".