21235300575523 has 4 divisors (see below), whose sum is σ = 21299455562488. Its totient is φ = 21171145588560.

The previous prime is 21235300575491. The next prime is 21235300575529. The reversal of 21235300575523 is 32557500353212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21235300575523 - 2⁵ = 21235300575491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21235300575523.

It is not an unprimeable number, because it can be changed into a prime (21235300575529) 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, 32077492986 + ... + 32077493647.

It is an arithmetic number, because the mean of its divisors is an integer number (5324863890622).

Almost surely, 2^{21235300575523} is an apocalyptic number.

21235300575523 is a deficient number, since it is larger than the sum of its proper divisors (64154986965).

21235300575523 is an equidigital number, since it uses as much as digits as its factorization.

21235300575523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64154986964.

The product of its (nonzero) digits is 945000, while the sum is 43.

The spelling of 21235300575523 in words is "twenty-one trillion, two hundred thirty-five billion, three hundred million, five hundred seventy-five thousand, five hundred twenty-three".