100518221 has 4 divisors (see below), whose sum is σ = 100918944. Its totient is φ = 100117500.

The previous prime is 100518203. The next prime is 100518239. The reversal of 100518221 is 122815001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (100518203) and next prime (100518239).

It is a cyclic number.

It is not a de Polignac number, because 100518221 - 2²² = 96323917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100518193 and 100518202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100518281) 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 in 3 ways as a sum of consecutive naturals, for example, 199985 + ... + 200486.

It is an arithmetic number, because the mean of its divisors is an integer number (25229736).

Almost surely, 2^100518221 is an apocalyptic number.

It is an amenable number.

100518221 is a deficient number, since it is larger than the sum of its proper divisors (400723).

100518221 is an equidigital number, since it uses as much as digits as its factorization.

100518221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400722.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 100518221 is about 10025.8775675748. The cubic root of 100518221 is about 464.9592919233.

The spelling of 100518221 in words is "one hundred million, five hundred eighteen thousand, two hundred twenty-one".