20012020121209 has 8 divisors (see below), whose sum is σ = 20026563190920. Its totient is φ = 19997477808000.

The previous prime is 20012020121183. The next prime is 20012020121231. The reversal of 20012020121209 is 90212102021002.

It can be written as a sum of positive squares in 4 ways, for example, as 4381486240000 + 15630533881209 = 2093200^2 + 3953547^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20012020121209 - 2³¹ = 20009872637561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20012020121209.

It is not an unprimeable number, because it can be changed into a prime (20012020121609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59566119 + ... + 59901139.

It is an arithmetic number, because the mean of its divisors is an integer number (2503320398865).

Almost surely, 2^{20012020121209} is an apocalyptic number.

It is an amenable number.

20012020121209 is a deficient number, since it is larger than the sum of its proper divisors (14543069711).

20012020121209 is a wasteful number, since it uses less digits than its factorization.

20012020121209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378251.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 20012020121209 in words is "twenty trillion, twelve billion, twenty million, one hundred twenty-one thousand, two hundred nine".