212205997 has 2 divisors, whose sum is σ = 212205998. Its totient is φ = 212205996.

The previous prime is 212205971. The next prime is 212206031. The reversal of 212205997 is 799502212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119006281 + 93199716 = 10909^2 + 9654^2 .

It is a cyclic number.

It is not a de Polignac number, because 212205997 - 2¹⁹ = 211681709 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212205907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106102998 + 106102999.

It is an arithmetic number, because the mean of its divisors is an integer number (106102999).

Almost surely, 2^212205997 is an apocalyptic number.

It is an amenable number.

212205997 is a deficient number, since it is larger than the sum of its proper divisors (1).

212205997 is an equidigital number, since it uses as much as digits as its factorization.

212205997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 212205997 is about 14567.2920270035. The cubic root of 212205997 is about 596.4662629549.

The spelling of 212205997 in words is "two hundred twelve million, two hundred five thousand, nine hundred ninety-seven".