197108270221 has 4 divisors (see below), whose sum is σ = 197599812444. Its totient is φ = 196616728000.

The previous prime is 197108270213. The next prime is 197108270237. The reversal of 197108270221 is 122072801791.

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

It can be written as a sum of positive squares in 2 ways, for example, as 191068648996 + 6039621225 = 437114^2 + 77715^2 .

It is a cyclic number.

It is not a de Polignac number, because 197108270221 - 2³ = 197108270213 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197108270321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245770510 + ... + 245771311.

It is an arithmetic number, because the mean of its divisors is an integer number (49399953111).

Almost surely, 2^197108270221 is an apocalyptic number.

It is an amenable number.

197108270221 is a deficient number, since it is larger than the sum of its proper divisors (491542223).

197108270221 is an equidigital number, since it uses as much as digits as its factorization.

197108270221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491542222.

The product of its (nonzero) digits is 28224, while the sum is 40.

The spelling of 197108270221 in words is "one hundred ninety-seven billion, one hundred eight million, two hundred seventy thousand, two hundred twenty-one".