821840055 has 8 divisors (see below), whose sum is σ = 1314944112. Its totient is φ = 438314688.

The previous prime is 821840017. The next prime is 821840083. The reversal of 821840055 is 550048128.

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

It is not a de Polignac number, because 821840055 - 2¹¹ = 821838007 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 821839998 and 821840025.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27394654 + ... + 27394683.

It is an arithmetic number, because the mean of its divisors is an integer number (164368014).

Almost surely, 2^821840055 is an apocalyptic number.

821840055 is a deficient number, since it is larger than the sum of its proper divisors (493104057).

821840055 is a wasteful number, since it uses less digits than its factorization.

821840055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54789345.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 821840055 is about 28667.7528767080. The cubic root of 821840055 is about 936.6897504193.

The spelling of 821840055 in words is "eight hundred twenty-one million, eight hundred forty thousand, fifty-five".