42216751 has 2 divisors, whose sum is σ = 42216752. Its totient is φ = 42216750.

The previous prime is 42216749. The next prime is 42216781. The reversal of 42216751 is 15761224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42216751 - 2¹ = 42216749 is a prime.

Together with 42216749, 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 (42216781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21108375 + 21108376.

It is an arithmetic number, because the mean of its divisors is an integer number (21108376).

Almost surely, 2^42216751 is an apocalyptic number.

42216751 is a deficient number, since it is larger than the sum of its proper divisors (1).

42216751 is an equidigital number, since it uses as much as digits as its factorization.

42216751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 28.

The square root of 42216751 is about 6497.4418812330. The cubic root of 42216751 is about 348.1996008900.

Adding to 42216751 its reverse (15761224), we get a palindrome (57977975).

The spelling of 42216751 in words is "forty-two million, two hundred sixteen thousand, seven hundred fifty-one".