212997 has 4 divisors (see below), whose sum is σ = 284000. Its totient is φ = 141996.

The previous prime is 212987. The next prime is 212999. The reversal of 212997 is 799212.

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.

It is not a de Polignac number, because 212997 - 2⁴ = 212981 is a prime.

It is a D-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 (212999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35497 + ... + 35502.

It is an arithmetic number, because the mean of its divisors is an integer number (71000).

2²¹²⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

212997 is a deficient number, since it is larger than the sum of its proper divisors (71003).

212997 is an equidigital number, since it uses as much as digits as its factorization.

212997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71002.

The product of its digits is 2268, while the sum is 30.

The square root of 212997 is about 461.5159802217. The cubic root of 212997 is about 59.7206458170.

The spelling of 212997 in words is "two hundred twelve thousand, nine hundred ninety-seven".