100016221 has 4 divisors (see below), whose sum is σ = 100414944. Its totient is φ = 99617500.

The previous prime is 100016207. The next prime is 100016227. The reversal of 100016221 is 122610001.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122610001 = 17 ⋅7212353.

It is a cyclic number.

It is not a de Polignac number, because 100016221 - 2²¹ = 97919069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100016227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198985 + ... + 199486.

It is an arithmetic number, because the mean of its divisors is an integer number (25103736).

Almost surely, 2^100016221 is an apocalyptic number.

It is an amenable number.

100016221 is a deficient number, since it is larger than the sum of its proper divisors (398723).

100016221 is an equidigital number, since it uses as much as digits as its factorization.

100016221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398722.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 100016221 is about 10000.8110171126. The cubic root of 100016221 is about 464.1839790752.

Adding to 100016221 its reverse (122610001), we get a palindrome (222626222).

The spelling of 100016221 in words is "one hundred million, sixteen thousand, two hundred twenty-one".