212681771 has 2 divisors, whose sum is σ = 212681772. Its totient is φ = 212681770.

The previous prime is 212681767. The next prime is 212681779. The reversal of 212681771 is 177186212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212681771 - 2² = 212681767 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (212681779) 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, 106340885 + 106340886.

It is an arithmetic number, because the mean of its divisors is an integer number (106340886).

Almost surely, 2^212681771 is an apocalyptic number.

212681771 is a deficient number, since it is larger than the sum of its proper divisors (1).

212681771 is an equidigital number, since it uses as much as digits as its factorization.

212681771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9408, while the sum is 35.

The square root of 212681771 is about 14583.6130982689. The cubic root of 212681771 is about 596.9116969881.

The spelling of 212681771 in words is "two hundred twelve million, six hundred eighty-one thousand, seven hundred seventy-one".