21765320341 has 2 divisors, whose sum is σ = 21765320342. Its totient is φ = 21765320340.

The previous prime is 21765320299. The next prime is 21765320351. The reversal of 21765320341 is 14302356712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12340988100 + 9424332241 = 111090^2 + 97079^2 .

It is a cyclic number.

It is not a de Polignac number, because 21765320341 - 2²³ = 21756931733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21765320297 and 21765320306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21765320351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10882660170 + 10882660171.

It is an arithmetic number, because the mean of its divisors is an integer number (10882660171).

Almost surely, 2^21765320341 is an apocalyptic number.

It is an amenable number.

21765320341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21765320341 is an equidigital number, since it uses as much as digits as its factorization.

21765320341 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30240, while the sum is 34.

The spelling of 21765320341 in words is "twenty-one billion, seven hundred sixty-five million, three hundred twenty thousand, three hundred forty-one".