100011221 has 8 divisors (see below), whose sum is σ = 106089984. Its totient is φ = 93954240.

The previous prime is 100011217. The next prime is 100011271. The reversal of 100011221 is 122110001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 100011221 - 2² = 100011217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100011199 and 100011208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100011271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4556 + ... + 14858.

It is an arithmetic number, because the mean of its divisors is an integer number (13261248).

Almost surely, 2^100011221 is an apocalyptic number.

It is an amenable number.

100011221 is a deficient number, since it is larger than the sum of its proper divisors (6078763).

100011221 is a wasteful number, since it uses less digits than its factorization.

100011221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10891.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 100011221 is about 10000.5610342620. The cubic root of 100011221 is about 464.1762438014.

Adding to 100011221 its reverse (122110001), we get a palindrome (222121222).

It can be divided in two parts, 10001 and 1221, that multiplied together give a palindrome (12211221).

The spelling of 100011221 in words is "one hundred million, eleven thousand, two hundred twenty-one".