23240205435521 has 4 divisors (see below), whose sum is σ = 23240316448512. Its totient is φ = 23240094422532.

The previous prime is 23240205435509. The next prime is 23240205435523. The reversal of 23240205435521 is 12553450204232.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23240205435521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23240205435523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55191881 + ... + 55611366.

It is an arithmetic number, because the mean of its divisors is an integer number (5810079112128).

Almost surely, 2^{23240205435521} is an apocalyptic number.

It is an amenable number.

23240205435521 is a deficient number, since it is larger than the sum of its proper divisors (111012991).

23240205435521 is a wasteful number, since it uses less digits than its factorization.

23240205435521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111012990.

The product of its (nonzero) digits is 288000, while the sum is 38.

Adding to 23240205435521 its reverse (12553450204232), we get a palindrome (35793655639753).

The spelling of 23240205435521 in words is "twenty-three trillion, two hundred forty billion, two hundred five million, four hundred thirty-five thousand, five hundred twenty-one".