42041642521 has 4 divisors (see below), whose sum is σ = 42042120372. Its totient is φ = 42041164672.

The previous prime is 42041642507. The next prime is 42041642543. The reversal of 42041642521 is 12524614024.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 30787615296 + 11254027225 = 175464^2 + 106085^2 .

It is a cyclic number.

It is not a de Polignac number, because 42041642521 - 2⁷ = 42041642393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42041642501) 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, 64516 + ... + 297061.

It is an arithmetic number, because the mean of its divisors is an integer number (10510530093).

Almost surely, 2^42041642521 is an apocalyptic number.

It is an amenable number.

42041642521 is a deficient number, since it is larger than the sum of its proper divisors (477851).

42041642521 is a wasteful number, since it uses less digits than its factorization.

42041642521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477850.

The product of its (nonzero) digits is 15360, while the sum is 31.

The spelling of 42041642521 in words is "forty-two billion, forty-one million, six hundred forty-two thousand, five hundred twenty-one".