42237521 has 2 divisors, whose sum is σ = 42237522. Its totient is φ = 42237520.

The previous prime is 42237463. The next prime is 42237523. The reversal of 42237521 is 12573224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38925121 + 3312400 = 6239^2 + 1820^2 .

It is a cyclic number.

It is not a de Polignac number, because 42237521 - 2⁶ = 42237457 is a prime.

It is a Sophie Germain prime.

Together with 42237523, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (42237523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21118760 + 21118761.

It is an arithmetic number, because the mean of its divisors is an integer number (21118761).

Almost surely, 2^42237521 is an apocalyptic number.

It is an amenable number.

42237521 is a deficient number, since it is larger than the sum of its proper divisors (1).

42237521 is an equidigital number, since it uses as much as digits as its factorization.

42237521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 26.

The square root of 42237521 is about 6499.0400060317. The cubic root of 42237521 is about 348.2566944989.

The spelling of 42237521 in words is "forty-two million, two hundred thirty-seven thousand, five hundred twenty-one".