212021080409 has 2 divisors, whose sum is σ = 212021080410. Its totient is φ = 212021080408.

The previous prime is 212021080393. The next prime is 212021080417. The reversal of 212021080409 is 904080120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179460682384 + 32560398025 = 423628^2 + 180445^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021080409 - 2⁴ = 212021080393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212021080429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010540204 + 106010540205.

It is an arithmetic number, because the mean of its divisors is an integer number (106010540205).

Almost surely, 2^212021080409 is an apocalyptic number.

It is an amenable number.

212021080409 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021080409 is an equidigital number, since it uses as much as digits as its factorization.

212021080409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 212021080409 in words is "two hundred twelve billion, twenty-one million, eighty thousand, four hundred nine".