20312231321209 has 4 divisors (see below), whose sum is σ = 20313601839460. Its totient is φ = 20310860802960.

The previous prime is 20312231321143. The next prime is 20312231321251. The reversal of 20312231321209 is 90212313221302.

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 10267153977600 + 10045077343609 = 3204240^2 + 3169397^2 .

It is a cyclic number.

It is not a de Polignac number, because 20312231321209 - 2⁹ = 20312231320697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20312231321269) 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, 685236894 + ... + 685266535.

It is an arithmetic number, because the mean of its divisors is an integer number (5078400459865).

Almost surely, 2^{20312231321209} is an apocalyptic number.

It is an amenable number.

20312231321209 is a deficient number, since it is larger than the sum of its proper divisors (1370518251).

20312231321209 is a wasteful number, since it uses less digits than its factorization.

20312231321209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370518250.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 20312231321209 in words is "twenty trillion, three hundred twelve billion, two hundred thirty-one million, three hundred twenty-one thousand, two hundred nine".