42350821 has 2 divisors, whose sum is σ = 42350822. Its totient is φ = 42350820.

The previous prime is 42350809. The next prime is 42350837. The reversal of 42350821 is 12805324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24117921 + 18232900 = 4911^2 + 4270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42350821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42350881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21175410 + 21175411.

It is an arithmetic number, because the mean of its divisors is an integer number (21175411).

Almost surely, 2^42350821 is an apocalyptic number.

It is an amenable number.

42350821 is a deficient number, since it is larger than the sum of its proper divisors (1).

42350821 is an equidigital number, since it uses as much as digits as its factorization.

42350821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 42350821 is about 6507.7508403442. The cubic root of 42350821 is about 348.5678100989.

The spelling of 42350821 in words is "forty-two million, three hundred fifty thousand, eight hundred twenty-one".