221846857 has 8 divisors (see below), whose sum is σ = 230195336. Its totient is φ = 213622272.

The previous prime is 221846851. The next prime is 221846861. The reversal of 221846857 is 758648122.

It is a happy number.

221846857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 104427961 + 117418896 = 10219^2 + 10836^2 .

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 221846857 - 2²³ = 213458249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221846851) 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, 27318 + ... + 34495.

It is an arithmetic number, because the mean of its divisors is an integer number (28774417).

Almost surely, 2^221846857 is an apocalyptic number.

It is an amenable number.

221846857 is a deficient number, since it is larger than the sum of its proper divisors (8348479).

221846857 is an equidigital number, since it uses as much as digits as its factorization.

221846857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61947.

The product of its digits is 215040, while the sum is 43.

The square root of 221846857 is about 14894.5243965694. The cubic root of 221846857 is about 605.3656301365.

The spelling of 221846857 in words is "two hundred twenty-one million, eight hundred forty-six thousand, eight hundred fifty-seven".