197106221 has 12 divisors (see below), whose sum is σ = 213875028. Its totient is φ = 181569024.

The previous prime is 197106199. The next prime is 197106271. The reversal of 197106221 is 122601791.

It can be written as a sum of positive squares in 6 ways, for example, as 46430596 + 150675625 = 6814^2 + 12275^2 .

It is not a de Polignac number, because 197106221 - 2⁶ = 197106157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197106271) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 112871 + ... + 114603.

It is an arithmetic number, because the mean of its divisors is an integer number (17822919).

Almost surely, 2^197106221 is an apocalyptic number.

It is an amenable number.

197106221 is a deficient number, since it is larger than the sum of its proper divisors (16768807).

197106221 is a wasteful number, since it uses less digits than its factorization.

197106221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432 (or 2419 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 197106221 is about 14039.4523041321. The cubic root of 197106221 is about 581.9693470785.

The spelling of 197106221 in words is "one hundred ninety-seven million, one hundred six thousand, two hundred twenty-one".