1012200021209 has 4 divisors (see below), whose sum is σ = 1090061561316. Its totient is φ = 934338481104.

The previous prime is 1012200021193. The next prime is 1012200021229. The reversal of 1012200021209 is 9021200022101.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155908891609 + 856291129600 = 394853^2 + 925360^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012200021209 - 2⁴ = 1012200021193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1012200021229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38930770034 + ... + 38930770059.

It is an arithmetic number, because the mean of its divisors is an integer number (272515390329).

Almost surely, 2^{1012200021209} is an apocalyptic number.

It is an amenable number.

1012200021209 is a deficient number, since it is larger than the sum of its proper divisors (77861540107).

1012200021209 is an equidigital number, since it uses as much as digits as its factorization.

1012200021209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77861540106.

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

The spelling of 1012200021209 in words is "one trillion, twelve billion, two hundred million, twenty-one thousand, two hundred nine".