20120321209 has 2 divisors, whose sum is σ = 20120321210. Its totient is φ = 20120321208.

The previous prime is 20120321203. The next prime is 20120321231. The reversal of 20120321209 is 90212302102.

It is an a-pointer prime, because the next prime (20120321231) can be obtained adding 20120321209 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19712160000 + 408161209 = 140400^2 + 20203^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120321209 - 2²¹ = 20118224057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20120321209.

It is not a weakly prime, because it can be changed into another prime (20120321203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060160604 + 10060160605.

It is an arithmetic number, because the mean of its divisors is an integer number (10060160605).

Almost surely, 2^20120321209 is an apocalyptic number.

It is an amenable number.

20120321209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120321209 is an equidigital number, since it uses as much as digits as its factorization.

20120321209 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 20120321209 in words is "twenty billion, one hundred twenty million, three hundred twenty-one thousand, two hundred nine".