20021331209 has 8 divisors (see below), whose sum is σ = 21919183200. Its totient is φ = 18136434400.

The previous prime is 20021331193. The next prime is 20021331241. The reversal of 20021331209 is 90213312002.

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 20021331209 - 2⁴ = 20021331193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20021331289) 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, 3235559 + ... + 3241740.

It is an arithmetic number, because the mean of its divisors is an integer number (2739897900).

Almost surely, 2^20021331209 is an apocalyptic number.

It is an amenable number.

20021331209 is a deficient number, since it is larger than the sum of its proper divisors (1897851991).

20021331209 is a wasteful number, since it uses less digits than its factorization.

20021331209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6477591.

The product of its (nonzero) digits is 648, while the sum is 23.

The spelling of 20021331209 in words is "twenty billion, twenty-one million, three hundred thirty-one thousand, two hundred nine".