212246442409 has 2 divisors, whose sum is σ = 212246442410. Its totient is φ = 212246442408.

The previous prime is 212246442349. The next prime is 212246442461. The reversal of 212246442409 is 904244642212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148280445184 + 63965997225 = 385072^2 + 252915^2 .

It is a cyclic number.

It is not a de Polignac number, because 212246442409 - 2¹¹ = 212246440361 is a prime.

It is not a weakly prime, because it can be changed into another prime (212246442479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106123221204 + 106123221205.

It is an arithmetic number, because the mean of its divisors is an integer number (106123221205).

Almost surely, 2^212246442409 is an apocalyptic number.

It is an amenable number.

212246442409 is a deficient number, since it is larger than the sum of its proper divisors (1).

212246442409 is an equidigital number, since it uses as much as digits as its factorization.

212246442409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 221184, while the sum is 40.

The spelling of 212246442409 in words is "two hundred twelve billion, two hundred forty-six million, four hundred forty-two thousand, four hundred nine".