42397565321 has 2 divisors, whose sum is σ = 42397565322. Its totient is φ = 42397565320.

The previous prime is 42397565303. The next prime is 42397565351. The reversal of 42397565321 is 12356579324.

42397565321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37449990400 + 4947574921 = 193520^2 + 70339^2 .

It is a cyclic number.

It is not a de Polignac number, because 42397565321 - 2²⁶ = 42330456457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42397565351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21198782660 + 21198782661.

It is an arithmetic number, because the mean of its divisors is an integer number (21198782661).

Almost surely, 2^42397565321 is an apocalyptic number.

It is an amenable number.

42397565321 is a deficient number, since it is larger than the sum of its proper divisors (1).

42397565321 is an equidigital number, since it uses as much as digits as its factorization.

42397565321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 47.

The spelling of 42397565321 in words is "forty-two billion, three hundred ninety-seven million, five hundred sixty-five thousand, three hundred twenty-one".