21839005705 has 16 divisors (see below), whose sum is σ = 29511479808. Its totient is φ = 15370560000.

The previous prime is 21839005691. The next prime is 21839005717. The reversal of 21839005705 is 50750093812.

It is not a de Polignac number, because 21839005705 - 2²³ = 21830617097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6402696 + ... + 6406105.

It is an arithmetic number, because the mean of its divisors is an integer number (1844467488).

Almost surely, 2^21839005705 is an apocalyptic number.

It is an amenable number.

21839005705 is a deficient number, since it is larger than the sum of its proper divisors (7672474103).

21839005705 is a wasteful number, since it uses less digits than its factorization.

21839005705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12808848.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 21839005705 in words is "twenty-one billion, eight hundred thirty-nine million, five thousand, seven hundred five".