21859731536 has 20 divisors (see below), whose sum is σ = 42509523264. Its totient is φ = 10889532000.

The previous prime is 21859731533. The next prime is 21859731539. The reversal of 21859731536 is 63513795812.

It is an interprime number because it is at equal distance from previous prime (21859731533) and next prime (21859731539).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21859731533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2516390 + ... + 2525061.

Almost surely, 2^21859731536 is an apocalyptic number.

It is an amenable number.

21859731536 is a deficient number, since it is larger than the sum of its proper divisors (20649791728).

21859731536 is a wasteful number, since it uses less digits than its factorization.

21859731536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5041730 (or 5041724 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 50.

The spelling of 21859731536 in words is "twenty-one billion, eight hundred fifty-nine million, seven hundred thirty-one thousand, five hundred thirty-six".