42530321521 has 4 divisors (see below), whose sum is σ = 42606678132. Its totient is φ = 42453964912.

The previous prime is 42530321473. The next prime is 42530321527. The reversal of 42530321521 is 12512303524.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8641561600 + 33888759921 = 92960^2 + 184089^2 .

It is a cyclic number.

It is not a de Polignac number, because 42530321521 - 2¹⁷ = 42530190449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42530321521.

It is not an unprimeable number, because it can be changed into a prime (42530321527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38177470 + ... + 38178583.

It is an arithmetic number, because the mean of its divisors is an integer number (10651669533).

Almost surely, 2^42530321521 is an apocalyptic number.

It is an amenable number.

42530321521 is a deficient number, since it is larger than the sum of its proper divisors (76356611).

42530321521 is an equidigital number, since it uses as much as digits as its factorization.

42530321521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76356610.

The product of its (nonzero) digits is 7200, while the sum is 28.

The spelling of 42530321521 in words is "forty-two billion, five hundred thirty million, three hundred twenty-one thousand, five hundred twenty-one".