20321244409 has 2 divisors, whose sum is σ = 20321244410. Its totient is φ = 20321244408.

The previous prime is 20321244379. The next prime is 20321244431. The reversal of 20321244409 is 90444212302.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18833445225 + 1487799184 = 137235^2 + 38572^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321244409 - 2⁹ = 20321243897 is a prime.

It is not a weakly prime, because it can be changed into another prime (20321244479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10160622204 + 10160622205.

It is an arithmetic number, because the mean of its divisors is an integer number (10160622205).

Almost surely, 2^20321244409 is an apocalyptic number.

It is an amenable number.

20321244409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20321244409 is an equidigital number, since it uses as much as digits as its factorization.

20321244409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 20321244409 in words is "twenty billion, three hundred twenty-one million, two hundred forty-four thousand, four hundred nine".