21830351909 has 2 divisors, whose sum is σ = 21830351910. Its totient is φ = 21830351908.

The previous prime is 21830351827. The next prime is 21830351923. The reversal of 21830351909 is 90915303812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14139588100 + 7690763809 = 118910^2 + 87697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21830351909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21830351989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10915175954 + 10915175955.

It is an arithmetic number, because the mean of its divisors is an integer number (10915175955).

Almost surely, 2^21830351909 is an apocalyptic number.

It is an amenable number.

21830351909 is a deficient number, since it is larger than the sum of its proper divisors (1).

21830351909 is an equidigital number, since it uses as much as digits as its factorization.

21830351909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 41.

The spelling of 21830351909 in words is "twenty-one billion, eight hundred thirty million, three hundred fifty-one thousand, nine hundred nine".