21839287393 has 16 divisors (see below), whose sum is σ = 27282816000. Its totient is φ = 16983493200.

The previous prime is 21839287369. The next prime is 21839287417. The reversal of 21839287393 is 39378293812.

It is an interprime number because it is at equal distance from previous prime (21839287369) and next prime (21839287417).

It is a cyclic number.

It is not a de Polignac number, because 21839287393 - 2⁹ = 21839286881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21839287693) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245773 + ... + 322618.

It is an arithmetic number, because the mean of its divisors is an integer number (1705176000).

Almost surely, 2^21839287393 is an apocalyptic number.

It is an amenable number.

21839287393 is a deficient number, since it is larger than the sum of its proper divisors (5443528607).

21839287393 is a wasteful number, since it uses less digits than its factorization.

21839287393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568908.

The product of its digits is 3919104, while the sum is 55.

The spelling of 21839287393 in words is "twenty-one billion, eight hundred thirty-nine million, two hundred eighty-seven thousand, three hundred ninety-three".