42021017 has 2 divisors, whose sum is σ = 42021018. Its totient is φ = 42021016.

The previous prime is 42020983. The next prime is 42021037. The reversal of 42021017 is 71012024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41847961 + 173056 = 6469^2 + 416^2 .

It is a cyclic number.

It is not a de Polignac number, because 42021017 - 2¹⁶ = 41955481 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42020986 and 42021004.

It is not a weakly prime, because it can be changed into another prime (42021037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21010508 + 21010509.

It is an arithmetic number, because the mean of its divisors is an integer number (21010509).

Almost surely, 2^42021017 is an apocalyptic number.

It is an amenable number.

42021017 is a deficient number, since it is larger than the sum of its proper divisors (1).

42021017 is an equidigital number, since it uses as much as digits as its factorization.

42021017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 42021017 is about 6482.3619923605. The cubic root of 42021017 is about 347.6606354963.

The spelling of 42021017 in words is "forty-two million, twenty-one thousand, seventeen".