197310221 has 4 divisors (see below), whose sum is σ = 198567132. Its totient is φ = 196053312.

The previous prime is 197310181. The next prime is 197310251. The reversal of 197310221 is 122013791.

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 42432196 + 154878025 = 6514^2 + 12445^2 .

It is a cyclic number.

It is not a de Polignac number, because 197310221 - 2²² = 193115917 is a prime.

It is a super-2 number, since 2×197310221² = 77862646622137682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197310251) 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, 628220 + ... + 628533.

It is an arithmetic number, because the mean of its divisors is an integer number (49641783).

Almost surely, 2^197310221 is an apocalyptic number.

It is an amenable number.

197310221 is a deficient number, since it is larger than the sum of its proper divisors (1256911).

197310221 is a wasteful number, since it uses less digits than its factorization.

197310221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256910.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 197310221 is about 14046.7156659484. The cubic root of 197310221 is about 582.1700524169.

The spelling of 197310221 in words is "one hundred ninety-seven million, three hundred ten thousand, two hundred twenty-one".