20310121209 has 32 divisors (see below), whose sum is σ = 31281719040. Its totient is φ = 11481120000.

The previous prime is 20310121199. The next prime is 20310121241. The reversal of 20310121209 is 90212101302.

It is not a de Polignac number, because 20310121209 - 2¹¹ = 20310119161 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (20310121259) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3027559 + ... + 3034259.

It is an arithmetic number, because the mean of its divisors is an integer number (977553720).

Almost surely, 2^20310121209 is an apocalyptic number.

It is an amenable number.

20310121209 is a deficient number, since it is larger than the sum of its proper divisors (10971597831).

20310121209 is a wasteful number, since it uses less digits than its factorization.

20310121209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8241.

The product of its (nonzero) digits is 216, while the sum is 21.

The spelling of 20310121209 in words is "twenty billion, three hundred ten million, one hundred twenty-one thousand, two hundred nine".