212021003209 has 2 divisors, whose sum is σ = 212021003210. Its totient is φ = 212021003208.

The previous prime is 212021003177. The next prime is 212021003219. The reversal of 212021003209 is 902300120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180744019600 + 31276983609 = 425140^2 + 176853^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021003209 - 2⁵ = 212021003177 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212021003209.

It is not a weakly prime, because it can be changed into another prime (212021003219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010501604 + 106010501605.

It is an arithmetic number, because the mean of its divisors is an integer number (106010501605).

Almost surely, 2^212021003209 is an apocalyptic number.

It is an amenable number.

212021003209 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021003209 is an equidigital number, since it uses as much as digits as its factorization.

212021003209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The spelling of 212021003209 in words is "two hundred twelve billion, twenty-one million, three thousand, two hundred nine".