42613305521 has 2 divisors, whose sum is σ = 42613305522. Its totient is φ = 42613305520.

The previous prime is 42613305517. The next prime is 42613305523. The reversal of 42613305521 is 12550331624.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28304361121 + 14308944400 = 168239^2 + 119620^2 .

It is a cyclic number.

It is not a de Polignac number, because 42613305521 - 2² = 42613305517 is a prime.

Together with 42613305523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42613305523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21306652760 + 21306652761.

It is an arithmetic number, because the mean of its divisors is an integer number (21306652761).

Almost surely, 2^42613305521 is an apocalyptic number.

It is an amenable number.

42613305521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42613305521 is an equidigital number, since it uses as much as digits as its factorization.

42613305521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 32.

The spelling of 42613305521 in words is "forty-two billion, six hundred thirteen million, three hundred five thousand, five hundred twenty-one".