212197 has 4 divisors (see below), whose sum is σ = 213120. Its totient is φ = 211276.

The previous prime is 212183. The next prime is 212203. The reversal of 212197 is 791212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 212197 - 2¹⁵ = 179429 is a prime.

It is an Ulam 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 (212117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204 + ... + 682.

It is an arithmetic number, because the mean of its divisors is an integer number (53280).

2²¹²¹⁹⁷ is an apocalyptic number.

It is an amenable number.

212197 is a deficient number, since it is larger than the sum of its proper divisors (923).

212197 is an equidigital number, since it uses as much as digits as its factorization.

212197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922.

The product of its digits is 252, while the sum is 22.

The square root of 212197 is about 460.6484559835. The cubic root of 212197 is about 59.6457833280.

The spelling of 212197 in words is "two hundred twelve thousand, one hundred ninety-seven".