23421534209 has 4 divisors (see below), whose sum is σ = 23469236400. Its totient is φ = 23373832020.

The previous prime is 23421534203. The next prime is 23421534211. The reversal of 23421534209 is 90243512432.

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-23421534209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23421534203) 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, 23850359 + ... + 23851340.

It is an arithmetic number, because the mean of its divisors is an integer number (5867309100).

Almost surely, 2^23421534209 is an apocalyptic number.

It is an amenable number.

23421534209 is a deficient number, since it is larger than the sum of its proper divisors (47702191).

23421534209 is an equidigital number, since it uses as much as digits as its factorization.

23421534209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47702190.

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 23421534209 in words is "twenty-three billion, four hundred twenty-one million, five hundred thirty-four thousand, two hundred nine".