23540405430021 has 4 divisors (see below), whose sum is σ = 31387207240032. Its totient is φ = 15693603620012.

The previous prime is 23540405429993. The next prime is 23540405430029. The reversal of 23540405430021 is 12003450404532.

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 not a de Polignac number, because 23540405430021 - 2¹³ = 23540405421829 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23540405430029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3923400905001 + ... + 3923400905006.

It is an arithmetic number, because the mean of its divisors is an integer number (7846801810008).

Almost surely, 2^{23540405430021} is an apocalyptic number.

It is an amenable number.

23540405430021 is a deficient number, since it is larger than the sum of its proper divisors (7846801810011).

23540405430021 is an equidigital number, since it uses as much as digits as its factorization.

23540405430021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7846801810010.

The product of its (nonzero) digits is 57600, while the sum is 33.

Adding to 23540405430021 its reverse (12003450404532), we get a palindrome (35543855834553).

The spelling of 23540405430021 in words is "twenty-three trillion, five hundred forty billion, four hundred five million, four hundred thirty thousand, twenty-one".