100018621 has 2 divisors, whose sum is σ = 100018622. Its totient is φ = 100018620.

The previous prime is 100018619. The next prime is 100018627. The reversal of 100018621 is 126810001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98604900 + 1413721 = 9930^2 + 1189^2 .

It is an emirp because it is prime and its reverse (126810001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100018621 - 2¹ = 100018619 is a prime.

Together with 100018619, 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 (100018627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50009310 + 50009311.

It is an arithmetic number, because the mean of its divisors is an integer number (50009311).

Almost surely, 2^100018621 is an apocalyptic number.

It is an amenable number.

100018621 is a deficient number, since it is larger than the sum of its proper divisors (1).

100018621 is an equidigital number, since it uses as much as digits as its factorization.

100018621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 100018621 is about 10000.9310066613. The cubic root of 100018621 is about 464.1876919151.

Adding to 100018621 its reverse (126810001), we get a palindrome (226828622).

The spelling of 100018621 in words is "one hundred million, eighteen thousand, six hundred twenty-one".