42050521 has 2 divisors, whose sum is σ = 42050522. Its totient is φ = 42050520.

The previous prime is 42050513. The next prime is 42050563. The reversal of 42050521 is 12505024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40500496 + 1550025 = 6364^2 + 1245^2 .

It is a cyclic number.

It is not a de Polignac number, because 42050521 - 2³ = 42050513 is a prime.

It is not a weakly prime, because it can be changed into another prime (42050221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21025260 + 21025261.

It is an arithmetic number, because the mean of its divisors is an integer number (21025261).

Almost surely, 2^42050521 is an apocalyptic number.

It is an amenable number.

42050521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42050521 is an equidigital number, since it uses as much as digits as its factorization.

42050521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 42050521 is about 6484.6373067428. The cubic root of 42050521 is about 347.7419835169.

Adding to 42050521 its reverse (12505024), we get a palindrome (54555545).

The spelling of 42050521 in words is "forty-two million, fifty thousand, five hundred twenty-one".