20120210009 has 2 divisors, whose sum is σ = 20120210010. Its totient is φ = 20120210008.

The previous prime is 20120209987. The next prime is 20120210029. The reversal of 20120210009 is 90001202102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10323169609 + 9797040400 = 101603^2 + 98980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20120210009 is a prime.

It is not a weakly prime, because it can be changed into another prime (20120210029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060105004 + 10060105005.

It is an arithmetic number, because the mean of its divisors is an integer number (10060105005).

Almost surely, 2^20120210009 is an apocalyptic number.

It is an amenable number.

20120210009 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120210009 is an equidigital number, since it uses as much as digits as its factorization.

20120210009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

The spelling of 20120210009 in words is "twenty billion, one hundred twenty million, two hundred ten thousand, nine".