21088308575 has 6 divisors (see below), whose sum is σ = 26149502664. Its totient is φ = 16870646840.

The previous prime is 21088308569. The next prime is 21088308587. The reversal of 21088308575 is 57580388012.

It is not a de Polignac number, because 21088308575 - 2⁶ = 21088308511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 421766147 + ... + 421766196.

It is an arithmetic number, because the mean of its divisors is an integer number (4358250444).

Almost surely, 2^21088308575 is an apocalyptic number.

21088308575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21088308575 is a deficient number, since it is larger than the sum of its proper divisors (5061194089).

21088308575 is an equidigital number, since it uses as much as digits as its factorization.

21088308575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843532353 (or 843532348 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 21088308575 in words is "twenty-one billion, eighty-eight million, three hundred eight thousand, five hundred seventy-five".