212211997 has 2 divisors, whose sum is σ = 212211998. Its totient is φ = 212211996.

The previous prime is 212211953. The next prime is 212212051. The reversal of 212211997 is 799112212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137804121 + 74407876 = 11739^2 + 8626^2 .

It is a cyclic number.

It is not a de Polignac number, because 212211997 - 2¹⁵ = 212179229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212211907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106105998 + 106105999.

It is an arithmetic number, because the mean of its divisors is an integer number (106105999).

Almost surely, 2^212211997 is an apocalyptic number.

It is an amenable number.

212211997 is a deficient number, since it is larger than the sum of its proper divisors (1).

212211997 is an equidigital number, since it uses as much as digits as its factorization.

212211997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 34.

The square root of 212211997 is about 14567.4979663633. The cubic root of 212211997 is about 596.4718844798.

The spelling of 212211997 in words is "two hundred twelve million, two hundred eleven thousand, nine hundred ninety-seven".