1123123211101 has 4 divisors (see below), whose sum is σ = 1123128322204. Its totient is φ = 1123118100000.

The previous prime is 1123123211071. The next prime is 1123123211129. The reversal of 1123123211101 is 1011123213211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 548635008601 + 574488202500 = 740699^2 + 757950^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123123211101 - 2⁷ = 1123123210973 is a prime.

It is a super-2 number, since 2×1123123211101² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123123211401) 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 3 ways as a sum of consecutive naturals, for example, 2210400 + ... + 2670601.

It is an arithmetic number, because the mean of its divisors is an integer number (280782080551).

Almost surely, 2^{1123123211101} is an apocalyptic number.

It is an amenable number.

1123123211101 is a deficient number, since it is larger than the sum of its proper divisors (5111103).

1123123211101 is an equidigital number, since it uses as much as digits as its factorization.

1123123211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5111102.

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

Adding to 1123123211101 its reverse (1011123213211), we get a palindrome (2134246424312).

The spelling of 1123123211101 in words is "one trillion, one hundred twenty-three billion, one hundred twenty-three million, two hundred eleven thousand, one hundred one".