2123112132605 has 4 divisors (see below), whose sum is σ = 2547734559132. Its totient is φ = 1698489706080.

The previous prime is 2123112132517. The next prime is 2123112132683. The reversal of 2123112132605 is 5062312113212.

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 643186356121 + 1479925776484 = 801989^2 + 1216522^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2123112132605 is a prime.

It is a super-2 number, since 2×2123112132605² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212311213256 + ... + 212311213265.

It is an arithmetic number, because the mean of its divisors is an integer number (636933639783).

Almost surely, 2^{2123112132605} is an apocalyptic number.

It is an amenable number.

2123112132605 is a deficient number, since it is larger than the sum of its proper divisors (424622426527).

2123112132605 is an equidigital number, since it uses as much as digits as its factorization.

2123112132605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424622426526.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 2123112132605 its reverse (5062312113212), we get a palindrome (7185424245817).

The spelling of 2123112132605 in words is "two trillion, one hundred twenty-three billion, one hundred twelve million, one hundred thirty-two thousand, six hundred five".