221397163 has 8 divisors (see below), whose sum is σ = 240030000. Its totient is φ = 202993248.

The previous prime is 221397109. The next prime is 221397179. The reversal of 221397163 is 361793122.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221397163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221397193) 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, 55213 + ... + 59086.

It is an arithmetic number, because the mean of its divisors is an integer number (30003750).

Almost surely, 2^221397163 is an apocalyptic number.

221397163 is a deficient number, since it is larger than the sum of its proper divisors (18632837).

221397163 is a wasteful number, since it uses less digits than its factorization.

221397163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114461.

The product of its digits is 13608, while the sum is 34.

The square root of 221397163 is about 14879.4207884581. The cubic root of 221397163 is about 604.9563185911.

The spelling of 221397163 in words is "two hundred twenty-one million, three hundred ninety-seven thousand, one hundred sixty-three".