42268621 has 2 divisors, whose sum is σ = 42268622. Its totient is φ = 42268620.

The previous prime is 42268619. The next prime is 42268627. The reversal of 42268621 is 12686224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35581225 + 6687396 = 5965^2 + 2586^2 .

It is a cyclic number.

It is not a de Polignac number, because 42268621 - 2¹ = 42268619 is a prime.

Together with 42268619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42268627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21134310 + 21134311.

It is an arithmetic number, because the mean of its divisors is an integer number (21134311).

Almost surely, 2^42268621 is an apocalyptic number.

It is an amenable number.

42268621 is a deficient number, since it is larger than the sum of its proper divisors (1).

42268621 is an equidigital number, since it uses as much as digits as its factorization.

42268621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 31.

The square root of 42268621 is about 6501.4322268251. The cubic root of 42268621 is about 348.3421487407.

The spelling of 42268621 in words is "forty-two million, two hundred sixty-eight thousand, six hundred twenty-one".