212101022009 has 2 divisors, whose sum is σ = 212101022010. Its totient is φ = 212101022008.

The previous prime is 212101021999. The next prime is 212101022033. The reversal of 212101022009 is 900220101212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211482256384 + 618765625 = 459872^2 + 24875^2 .

It is a cyclic number.

It is not a de Polignac number, because 212101022009 - 2²⁰ = 212099973433 is a prime.

It is not a weakly prime, because it can be changed into another prime (212101022059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106050511004 + 106050511005.

It is an arithmetic number, because the mean of its divisors is an integer number (106050511005).

Almost surely, 2^212101022009 is an apocalyptic number.

It is an amenable number.

212101022009 is a deficient number, since it is larger than the sum of its proper divisors (1).

212101022009 is an equidigital number, since it uses as much as digits as its factorization.

212101022009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 212101022009 in words is "two hundred twelve billion, one hundred one million, twenty-two thousand, nine".