21004075239 has 8 divisors (see below), whose sum is σ = 32006209920. Its totient is φ = 12002328696.

The previous prime is 21004075237. The next prime is 21004075247. The reversal of 21004075239 is 93257040012.

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

It is not a de Polignac number, because 21004075239 - 2¹ = 21004075237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004075231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 500097009 + ... + 500097050.

It is an arithmetic number, because the mean of its divisors is an integer number (4000776240).

Almost surely, 2^21004075239 is an apocalyptic number.

21004075239 is a deficient number, since it is larger than the sum of its proper divisors (11002134681).

21004075239 is a wasteful number, since it uses less digits than its factorization.

21004075239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000194069.

The product of its (nonzero) digits is 15120, while the sum is 33.

The spelling of 21004075239 in words is "twenty-one billion, four million, seventy-five thousand, two hundred thirty-nine".