42741221 has 2 divisors, whose sum is σ = 42741222. Its totient is φ = 42741220.

The previous prime is 42741211. The next prime is 42741227. The reversal of 42741221 is 12214724.

42741221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42393121 + 348100 = 6511^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 42741221 - 2²² = 38546917 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42741227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21370610 + 21370611.

It is an arithmetic number, because the mean of its divisors is an integer number (21370611).

Almost surely, 2^42741221 is an apocalyptic number.

It is an amenable number.

42741221 is a deficient number, since it is larger than the sum of its proper divisors (1).

42741221 is an equidigital number, since it uses as much as digits as its factorization.

42741221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 896, while the sum is 23.

The square root of 42741221 is about 6537.6770339319. The cubic root of 42741221 is about 349.6355962416.

Adding to 42741221 its reverse (12214724), we get a palindrome (54955945).

The spelling of 42741221 in words is "forty-two million, seven hundred forty-one thousand, two hundred twenty-one".