42205413521 has 4 divisors (see below), whose sum is σ = 43001742132. Its totient is φ = 41409084912.

The previous prime is 42205413491. The next prime is 42205413527. The reversal of 42205413521 is 12531450224.

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 23727089296 + 18478324225 = 154036^2 + 135935^2 .

It is a cyclic number.

It is not a de Polignac number, because 42205413521 - 2²² = 42201219217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42205413527) 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, 398164226 + ... + 398164331.

It is an arithmetic number, because the mean of its divisors is an integer number (10750435533).

Almost surely, 2^42205413521 is an apocalyptic number.

It is an amenable number.

42205413521 is a deficient number, since it is larger than the sum of its proper divisors (796328611).

42205413521 is an equidigital number, since it uses as much as digits as its factorization.

42205413521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 796328610.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 42205413521 its reverse (12531450224), we get a palindrome (54736863745).

The spelling of 42205413521 in words is "forty-two billion, two hundred five million, four hundred thirteen thousand, five hundred twenty-one".