212106197 has 2 divisors, whose sum is σ = 212106198. Its totient is φ = 212106196.

The previous prime is 212106151. The next prime is 212106241. The reversal of 212106197 is 791601212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179399236 + 32706961 = 13394^2 + 5719^2 .

It is a cyclic number.

It is not a de Polignac number, because 212106197 - 2⁶ = 212106133 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 (212106397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106053098 + 106053099.

It is an arithmetic number, because the mean of its divisors is an integer number (106053099).

Almost surely, 2^212106197 is an apocalyptic number.

It is an amenable number.

212106197 is a deficient number, since it is larger than the sum of its proper divisors (1).

212106197 is an equidigital number, since it uses as much as digits as its factorization.

212106197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 212106197 is about 14563.8661419281. The cubic root of 212106197 is about 596.3727427149.

The spelling of 212106197 in words is "two hundred twelve million, one hundred six thousand, one hundred ninety-seven".