23211345505505 has 4 divisors (see below), whose sum is σ = 27853614606612. Its totient is φ = 18569076404400.

The previous prime is 23211345505501. The next prime is 23211345505559. The reversal of 23211345505505 is 50550554311232.

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 9570385708816 + 13640959796689 = 3093604^2 + 3693367^2 .

It is not a de Polignac number, because 23211345505505 - 2² = 23211345505501 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23211345505501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2321134550546 + ... + 2321134550555.

It is an arithmetic number, because the mean of its divisors is an integer number (6963403651653).

Almost surely, 2^{23211345505505} is an apocalyptic number.

It is an amenable number.

23211345505505 is a deficient number, since it is larger than the sum of its proper divisors (4642269101107).

23211345505505 is an equidigital number, since it uses as much as digits as its factorization.

23211345505505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4642269101106.

The product of its (nonzero) digits is 450000, while the sum is 41.

Adding to 23211345505505 its reverse (50550554311232), we get a palindrome (73761899816737).

The spelling of 23211345505505 in words is "twenty-three trillion, two hundred eleven billion, three hundred forty-five million, five hundred five thousand, five hundred five".