212021011271 has 2 divisors, whose sum is σ = 212021011272. Its totient is φ = 212021011270.

The previous prime is 212021011259. The next prime is 212021011273. The reversal of 212021011271 is 172110120212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212021011271 is a prime.

It is a Sophie Germain prime.

Together with 212021011273, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212021011273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010505635 + 106010505636.

It is an arithmetic number, because the mean of its divisors is an integer number (106010505636).

Almost surely, 2^212021011271 is an apocalyptic number.

212021011271 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021011271 is an equidigital number, since it uses as much as digits as its factorization.

212021011271 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 20.

Adding to 212021011271 its reverse (172110120212), we get a palindrome (384131131483).

The spelling of 212021011271 in words is "two hundred twelve billion, twenty-one million, eleven thousand, two hundred seventy-one".