21839012005 has 8 divisors (see below), whose sum is σ = 27748391832. Its totient is φ = 16443491328.

The previous prime is 21839011951. The next prime is 21839012087. The reversal of 21839012005 is 50021093812.

It can be written as a sum of positive squares in 4 ways, for example, as 662650564 + 21176361441 = 25742^2 + 145521^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21839012005 - 2⁷ = 21839011877 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 7 ways as a sum of consecutive naturals, for example, 128464692 + ... + 128464861.

It is an arithmetic number, because the mean of its divisors is an integer number (3468548979).

Almost surely, 2^21839012005 is an apocalyptic number.

It is an amenable number.

21839012005 is a deficient number, since it is larger than the sum of its proper divisors (5909379827).

21839012005 is a wasteful number, since it uses less digits than its factorization.

21839012005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256929575.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 21839012005 in words is "twenty-one billion, eight hundred thirty-nine million, twelve thousand, five".