11311021131123 has 32 divisors (see below), whose sum is σ = 17248390387200. Its totient is φ = 6458735817216.

The previous prime is 11311021131071. The next prime is 11311021131133. The reversal of 11311021131123 is 32113112011311.

It is not a de Polignac number, because 11311021131123 - 2¹² = 11311021127027 is a prime.

It is a super-2 number, since 2×11311021131123² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 11311021131123.

It is not an unprimeable number, because it can be changed into a prime (11311021131133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 555295483 + ... + 555315851.

It is an arithmetic number, because the mean of its divisors is an integer number (539012199600).

Almost surely, 2^{11311021131123} is an apocalyptic number.

11311021131123 is a deficient number, since it is larger than the sum of its proper divisors (5937369256077).

11311021131123 is a wasteful number, since it uses less digits than its factorization.

11311021131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38331.

The product of its (nonzero) digits is 108, while the sum is 21.

Adding to 11311021131123 its reverse (32113112011311), we get a palindrome (43424133142434).

The spelling of 11311021131123 in words is "eleven trillion, three hundred eleven billion, twenty-one million, one hundred thirty-one thousand, one hundred twenty-three".