21611173554471 has 8 divisors (see below), whose sum is σ = 28814925092464. Its totient is φ = 14407435526400.

The previous prime is 21611173554437. The next prime is 21611173554613. The reversal of 21611173554471 is 17445537111612.

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

It is not a de Polignac number, because 21611173554471 - 2¹⁵ = 21611173521703 is a prime.

It is a super-3 number, since 3×21611173554471³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21611173554471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21611173554401) 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, 1267725 + ... + 6695481.

It is an arithmetic number, because the mean of its divisors is an integer number (3601865636558).

Almost surely, 2^{21611173554471} is an apocalyptic number.

21611173554471 is a deficient number, since it is larger than the sum of its proper divisors (7203751537993).

21611173554471 is a wasteful number, since it uses less digits than its factorization.

21611173554471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6754961.

The product of its digits is 705600, while the sum is 48.

The spelling of 21611173554471 in words is "twenty-one trillion, six hundred eleven billion, one hundred seventy-three million, five hundred fifty-four thousand, four hundred seventy-one".