212170997 has 2 divisors, whose sum is σ = 212170998. Its totient is φ = 212170996.

The previous prime is 212170961. The next prime is 212171041. The reversal of 212170997 is 799071212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 191794801 + 20376196 = 13849^2 + 4514^2 .

It is a cyclic number.

It is not a de Polignac number, because 212170997 - 2¹⁰ = 212169973 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212170997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212170597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106085498 + 106085499.

It is an arithmetic number, because the mean of its divisors is an integer number (106085499).

Almost surely, 2^212170997 is an apocalyptic number.

It is an amenable number.

212170997 is a deficient number, since it is larger than the sum of its proper divisors (1).

212170997 is an equidigital number, since it uses as much as digits as its factorization.

212170997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 212170997 is about 14566.0906560408. The cubic root of 212170997 is about 596.4334686146.

The spelling of 212170997 in words is "two hundred twelve million, one hundred seventy thousand, nine hundred ninety-seven".