212071081 has 2 divisors, whose sum is σ = 212071082. Its totient is φ = 212071080.

The previous prime is 212071051. The next prime is 212071099. The reversal of 212071081 is 180170212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110061081 + 102010000 = 10491^2 + 10100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212071081 is a prime.

It is a super-2 number, since 2×212071081² = 89948286793017122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (212071021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106035540 + 106035541.

It is an arithmetic number, because the mean of its divisors is an integer number (106035541).

Almost surely, 2^212071081 is an apocalyptic number.

It is an amenable number.

212071081 is a deficient number, since it is larger than the sum of its proper divisors (1).

212071081 is an equidigital number, since it uses as much as digits as its factorization.

212071081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 212071081 is about 14562.6605055532. The cubic root of 212071081 is about 596.3398293577.

The spelling of 212071081 in words is "two hundred twelve million, seventy-one thousand, eighty-one".