221338197 has 16 divisors (see below), whose sum is σ = 328144960. Its totient is φ = 147452400.

The previous prime is 221338193. The next prime is 221338207. The reversal of 221338197 is 791833122.

221338197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221338197 - 2² = 221338193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221338193) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58122 + ... + 61812.

It is an arithmetic number, because the mean of its divisors is an integer number (20509060).

Almost surely, 2^221338197 is an apocalyptic number.

221338197 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

221338197 is a deficient number, since it is larger than the sum of its proper divisors (106806763).

221338197 is a wasteful number, since it uses less digits than its factorization.

221338197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5921 (or 5915 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 221338197 is about 14877.4391949690. The cubic root of 221338197 is about 604.9026066387.

The spelling of 221338197 in words is "two hundred twenty-one million, three hundred thirty-eight thousand, one hundred ninety-seven".