20009339321 has 2 divisors, whose sum is σ = 20009339322. Its totient is φ = 20009339320.

The previous prime is 20009339249. The next prime is 20009339323. The reversal of 20009339321 is 12393390002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19990849321 + 18490000 = 141389^2 + 4300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20009339321 is a prime.

Together with 20009339323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20009339323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004669660 + 10004669661.

It is an arithmetic number, because the mean of its divisors is an integer number (10004669661).

Almost surely, 2^20009339321 is an apocalyptic number.

It is an amenable number.

20009339321 is a deficient number, since it is larger than the sum of its proper divisors (1).

20009339321 is an equidigital number, since it uses as much as digits as its factorization.

20009339321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 32.

The spelling of 20009339321 in words is "twenty billion, nine million, three hundred thirty-nine thousand, three hundred twenty-one".