20120001111209 has 2 divisors, whose sum is σ = 20120001111210. Its totient is φ = 20120001111208.

The previous prime is 20120001111173. The next prime is 20120001111239. The reversal of 20120001111209 is 90211110002102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18985888998400 + 1134112112809 = 4357280^2 + 1064947^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120001111209 - 2¹⁶ = 20120001045673 is a prime.

It is not a weakly prime, because it can be changed into another prime (20120001111239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060000555604 + 10060000555605.

It is an arithmetic number, because the mean of its divisors is an integer number (10060000555605).

Almost surely, 2^{20120001111209} is an apocalyptic number.

It is an amenable number.

20120001111209 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120001111209 is an equidigital number, since it uses as much as digits as its factorization.

20120001111209 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 20.

The spelling of 20120001111209 in words is "twenty trillion, one hundred twenty billion, one million, one hundred eleven thousand, two hundred nine".