21256159719 has 8 divisors (see below), whose sum is σ = 28384425712. Its totient is φ = 14149333440.

The previous prime is 21256159643. The next prime is 21256159721. The reversal of 21256159719 is 91795165212.

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

It is not a de Polignac number, because 21256159719 - 2²¹ = 21254062567 is a prime.

It is a super-2 number, since 2×21256159719² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21256159739) 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, 5357614 + ... + 5361579.

It is an arithmetic number, because the mean of its divisors is an integer number (3548053214).

Almost surely, 2^21256159719 is an apocalyptic number.

21256159719 is a deficient number, since it is larger than the sum of its proper divisors (7128265993).

21256159719 is a wasteful number, since it uses less digits than its factorization.

21256159719 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10719857.

The product of its digits is 340200, while the sum is 48.

The spelling of 21256159719 in words is "twenty-one billion, two hundred fifty-six million, one hundred fifty-nine thousand, seven hundred nineteen".