855835221 has 16 divisors (see below), whose sum is σ = 1253399040. Its totient is φ = 517025520.

The previous prime is 855835217. The next prime is 855835229. The reversal of 855835221 is 122538558.

It is not a de Polignac number, because 855835221 - 2² = 855835217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 855835221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855835229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325095 + ... + 327716.

It is an arithmetic number, because the mean of its divisors is an integer number (78337440).

Almost surely, 2^855835221 is an apocalyptic number.

It is an amenable number.

855835221 is a deficient number, since it is larger than the sum of its proper divisors (397563819).

855835221 is a wasteful number, since it uses less digits than its factorization.

855835221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652856.

The product of its digits is 96000, while the sum is 39.

The square root of 855835221 is about 29254.6615259859. The cubic root of 855835221 is about 949.4309504357.

The spelling of 855835221 in words is "eight hundred fifty-five million, eight hundred thirty-five thousand, two hundred twenty-one".