21688852446471 has 8 divisors (see below), whose sum is σ = 33049679918464. Its totient is φ = 12393629969400.

The previous prime is 21688852446433. The next prime is 21688852446511. The reversal of 21688852446471 is 17464425888612.

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

It is not a de Polignac number, because 21688852446471 - 2¹⁹ = 21688851922183 is a prime.

It is a super-3 number, since 3×21688852446471³ (a number of 41 digits) contains 333 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 (21688852446271) 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, 516401248705 + ... + 516401248746.

It is an arithmetic number, because the mean of its divisors is an integer number (4131209989808).

Almost surely, 2^{21688852446471} is an apocalyptic number.

21688852446471 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21688852446471 is a deficient number, since it is larger than the sum of its proper divisors (11360827471993).

21688852446471 is a wasteful number, since it uses less digits than its factorization.

21688852446471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1032802497461.

The product of its digits is 165150720, while the sum is 66.

The spelling of 21688852446471 in words is "twenty-one trillion, six hundred eighty-eight billion, eight hundred fifty-two million, four hundred forty-six thousand, four hundred seventy-one".