1311021121123 has 16 divisors (see below), whose sum is σ = 1519552535040. Its totient is φ = 1107803289600.

The previous prime is 1311021121087. The next prime is 1311021121127. The reversal of 1311021121123 is 3211211201131.

It is not a de Polignac number, because 1311021121123 - 2²⁹ = 1310484250211 is a prime.

It is a super-2 number, since 2×1311021121123² (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 1311021121123.

It is not an unprimeable number, because it can be changed into a prime (1311021121127) 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, 5555683 + ... + 5786851.

It is an arithmetic number, because the mean of its divisors is an integer number (94972033440).

Almost surely, 2^{1311021121123} is an apocalyptic number.

1311021121123 is a deficient number, since it is larger than the sum of its proper divisors (208531413917).

1311021121123 is a wasteful number, since it uses less digits than its factorization.

1311021121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242658.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1311021121123 its reverse (3211211201131), we get a palindrome (4522232322254).

The spelling of 1311021121123 in words is "one trillion, three hundred eleven billion, twenty-one million, one hundred twenty-one thousand, one hundred twenty-three".