100420217 has 2 divisors, whose sum is σ = 100420218. Its totient is φ = 100420216.

The previous prime is 100420181. The next prime is 100420261. The reversal of 100420217 is 712024001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74978281 + 25441936 = 8659^2 + 5044^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100420217 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 100420195 and 100420204.

It is not a weakly prime, because it can be changed into another prime (100620217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50210108 + 50210109.

It is an arithmetic number, because the mean of its divisors is an integer number (50210109).

Almost surely, 2^100420217 is an apocalyptic number.

It is an amenable number.

100420217 is a deficient number, since it is larger than the sum of its proper divisors (1).

100420217 is an equidigital number, since it uses as much as digits as its factorization.

100420217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 100420217 is about 10020.9888234645. The cubic root of 100420217 is about 464.8081329680.

Adding to 100420217 its reverse (712024001), we get a palindrome (812444218).

The spelling of 100420217 in words is "one hundred million, four hundred twenty thousand, two hundred seventeen".