42216533 has 2 divisors, whose sum is σ = 42216534. Its totient is φ = 42216532.

The previous prime is 42216521. The next prime is 42216541. The reversal of 42216533 is 33561224.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33443089 + 8773444 = 5783^2 + 2962^2 .

It is a cyclic number.

It is not a de Polignac number, because 42216533 - 2⁶ = 42216469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42216133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21108266 + 21108267.

It is an arithmetic number, because the mean of its divisors is an integer number (21108267).

Almost surely, 2^42216533 is an apocalyptic number.

It is an amenable number.

42216533 is a deficient number, since it is larger than the sum of its proper divisors (1).

42216533 is an equidigital number, since it uses as much as digits as its factorization.

42216533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 26.

The square root of 42216533 is about 6497.4251053783. The cubic root of 42216533 is about 348.1990015415.

Adding to 42216533 its reverse (33561224), we get a palindrome (75777757).

The spelling of 42216533 in words is "forty-two million, two hundred sixteen thousand, five hundred thirty-three".