221557163 has 4 divisors (see below), whose sum is σ = 221903448. Its totient is φ = 221210880.

The previous prime is 221557109. The next prime is 221557169. The reversal of 221557163 is 361755122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221557163 - 2⁶ = 221557099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221557169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172181 + ... + 173462.

It is an arithmetic number, because the mean of its divisors is an integer number (55475862).

Almost surely, 2^221557163 is an apocalyptic number.

221557163 is a deficient number, since it is larger than the sum of its proper divisors (346285).

221557163 is an equidigital number, since it uses as much as digits as its factorization.

221557163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346284.

The product of its digits is 12600, while the sum is 32.

The square root of 221557163 is about 14884.7963707939. The cubic root of 221557163 is about 605.1020140796.

The spelling of 221557163 in words is "two hundred twenty-one million, five hundred fifty-seven thousand, one hundred sixty-three".