21641278690471 has 8 divisors (see below), whose sum is σ = 23608873749888. Its totient is φ = 19673717979000.

The previous prime is 21641278690441. The next prime is 21641278690517. The reversal of 21641278690471 is 17409687214612.

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

It is a cyclic number.

It is not a de Polignac number, because 21641278690471 - 2¹¹ = 21641278688423 is a prime.

It is a super-3 number, since 3×21641278690471³ (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 (21641278690441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7260675 + ... + 9797956.

It is an arithmetic number, because the mean of its divisors is an integer number (2951109218736).

Almost surely, 2^{21641278690471} is an apocalyptic number.

21641278690471 is a deficient number, since it is larger than the sum of its proper divisors (1967595059417).

21641278690471 is a wasteful number, since it uses less digits than its factorization.

21641278690471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17173973.

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 21641278690471 in words is "twenty-one trillion, six hundred forty-one billion, two hundred seventy-eight million, six hundred ninety thousand, four hundred seventy-one".