212211397 has 2 divisors, whose sum is σ = 212211398. Its totient is φ = 212211396.

The previous prime is 212211371. The next prime is 212211421. The reversal of 212211397 is 793112212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167935681 + 44275716 = 12959^2 + 6654^2 .

It is a cyclic number.

It is not a de Polignac number, because 212211397 - 2⁷ = 212211269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212211997) 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, 106105698 + 106105699.

It is an arithmetic number, because the mean of its divisors is an integer number (106105699).

Almost surely, 2^212211397 is an apocalyptic number.

It is an amenable number.

212211397 is a deficient number, since it is larger than the sum of its proper divisors (1).

212211397 is an equidigital number, since it uses as much as digits as its factorization.

212211397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1512, while the sum is 28.

The square root of 212211397 is about 14567.4773725584. The cubic root of 212211397 is about 596.4713223320.

The spelling of 212211397 in words is "two hundred twelve million, two hundred eleven thousand, three hundred ninety-seven".