855228621 has 8 divisors (see below), whose sum is σ = 1228020640. Its totient is φ = 526294512.

The previous prime is 855228613. The next prime is 855228623. The reversal of 855228621 is 126822558.

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

It is not a de Polignac number, because 855228621 - 2³ = 855228613 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 21928939 = 855228621 / (8 + 5 + 5 + 2 + 2 + 8 + 6 + 2 + 1).

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 855228621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855228623) 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, 10964431 + ... + 10964508.

It is an arithmetic number, because the mean of its divisors is an integer number (153502580).

Almost surely, 2^855228621 is an apocalyptic number.

It is an amenable number.

855228621 is a deficient number, since it is larger than the sum of its proper divisors (372792019).

855228621 is a wasteful number, since it uses less digits than its factorization.

855228621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21928955.

The product of its digits is 76800, while the sum is 39.

The square root of 855228621 is about 29244.2921097434. The cubic root of 855228621 is about 949.2065844510.

It can be divided in two parts, 8552 and 28621, that added together give a palindrome (37173).

The spelling of 855228621 in words is "eight hundred fifty-five million, two hundred twenty-eight thousand, six hundred twenty-one".