42404241521 has 4 divisors (see below), whose sum is σ = 42532351344. Its totient is φ = 42276131700.

The previous prime is 42404241487. The next prime is 42404241527. The reversal of 42404241521 is 12514240424.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42404241521 - 2⁶ = 42404241457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42404241527) 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, 64054415 + ... + 64055076.

It is an arithmetic number, because the mean of its divisors is an integer number (10633087836).

Almost surely, 2^42404241521 is an apocalyptic number.

It is an amenable number.

42404241521 is a deficient number, since it is larger than the sum of its proper divisors (128109823).

42404241521 is a wasteful number, since it uses less digits than its factorization.

42404241521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128109822.

The product of its (nonzero) digits is 10240, while the sum is 29.

Adding to 42404241521 its reverse (12514240424), we get a palindrome (54918481945).

The spelling of 42404241521 in words is "forty-two billion, four hundred four million, two hundred forty-one thousand, five hundred twenty-one".