1012020011209 has 4 divisors (see below), whose sum is σ = 1012026031380. Its totient is φ = 1012013991040.

The previous prime is 1012020011183. The next prime is 1012020011213. The reversal of 1012020011209 is 9021100202101.

It is a happy number.

1012020011209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 815278973184 + 196741038025 = 902928^2 + 443555^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012020011209 - 2¹³ = 1012020003017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012020012209) 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, 2750464 + ... + 3096625.

It is an arithmetic number, because the mean of its divisors is an integer number (253006507845).

Almost surely, 2^{1012020011209} is an apocalyptic number.

It is an amenable number.

1012020011209 is a deficient number, since it is larger than the sum of its proper divisors (6020171).

1012020011209 is an equidigital number, since it uses as much as digits as its factorization.

1012020011209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6020170.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 1012020011209 in words is "one trillion, twelve billion, twenty million, eleven thousand, two hundred nine".