21389376535 has 8 divisors (see below), whose sum is σ = 25719530256. Its totient is φ = 17076648960.

The previous prime is 21389376527. The next prime is 21389376581. The reversal of 21389376535 is 53567398312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21389376535 - 2³ = 21389376527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4353834 + ... + 4358743.

It is an arithmetic number, because the mean of its divisors is an integer number (3214941282).

Almost surely, 2^21389376535 is an apocalyptic number.

21389376535 is a deficient number, since it is larger than the sum of its proper divisors (4330153721).

21389376535 is an equidigital number, since it uses as much as digits as its factorization.

21389376535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8713073.

The product of its digits is 4082400, while the sum is 52.

The spelling of 21389376535 in words is "twenty-one billion, three hundred eighty-nine million, three hundred seventy-six thousand, five hundred thirty-five".