100005221 has 4 divisors (see below), whose sum is σ = 100129344. Its totient is φ = 99881100.

The previous prime is 100005197. The next prime is 100005239. The reversal of 100005221 is 122500001.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100005221 is a prime.

It is a super-3 number, since 3×100005221³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100005281) 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, 60845 + ... + 62466.

It is an arithmetic number, because the mean of its divisors is an integer number (25032336).

Almost surely, 2^100005221 is an apocalyptic number.

It is an amenable number.

100005221 is a deficient number, since it is larger than the sum of its proper divisors (124123).

100005221 is an equidigital number, since it uses as much as digits as its factorization.

100005221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124122.

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 100005221 is about 10000.2610465927. The cubic root of 100005221 is about 464.1669611325.

Adding to 100005221 its reverse (122500001), we get a palindrome (222505222).

The spelling of 100005221 in words is "one hundred million, five thousand, two hundred twenty-one".