320121203009 has 2 divisors, whose sum is σ = 320121203010. Its totient is φ = 320121203008.

The previous prime is 320121202993. The next prime is 320121203053. The reversal of 320121203009 is 900302121023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 319835491600 + 285711409 = 565540^2 + 16903^2 .

It is a cyclic number.

It is not a de Polignac number, because 320121203009 - 2⁴ = 320121202993 is a prime.

It is not a weakly prime, because it can be changed into another prime (320121205009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160060601504 + 160060601505.

It is an arithmetic number, because the mean of its divisors is an integer number (160060601505).

Almost surely, 2^320121203009 is an apocalyptic number.

It is an amenable number.

320121203009 is a deficient number, since it is larger than the sum of its proper divisors (1).

320121203009 is an equidigital number, since it uses as much as digits as its factorization.

320121203009 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 320121203009 in words is "three hundred twenty billion, one hundred twenty-one million, two hundred three thousand, nine".