1200020112209 has 2 divisors, whose sum is σ = 1200020112210. Its totient is φ = 1200020112208.

The previous prime is 1200020112173. The next prime is 1200020112217. The reversal of 1200020112209 is 9022110200021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1093900534609 + 106119577600 = 1045897^2 + 325760^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200020112209 is a prime.

It is a super-2 number, since 2×1200020112209² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1200020112229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600010056104 + 600010056105.

It is an arithmetic number, because the mean of its divisors is an integer number (600010056105).

Almost surely, 2^{1200020112209} is an apocalyptic number.

It is an amenable number.

1200020112209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200020112209 is an equidigital number, since it uses as much as digits as its factorization.

1200020112209 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 1200020112209 in words is "one trillion, two hundred billion, twenty million, one hundred twelve thousand, two hundred nine".