100000121 has 8 divisors (see below), whose sum is σ = 107809800. Its totient is φ = 92207232.

The previous prime is 100000081. The next prime is 100000123. The reversal of 100000121 is 121000001.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 698896 + 99301225 = 836^2 + 9965^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-100000121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100000123) 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 7 ways as a sum of consecutive naturals, for example, 9971 + ... + 17303.

It is an arithmetic number, because the mean of its divisors is an integer number (13476225).

Almost surely, 2^100000121 is an apocalyptic number.

It is an amenable number.

100000121 is a deficient number, since it is larger than the sum of its proper divisors (7809679).

100000121 is a wasteful number, since it uses less digits than its factorization.

100000121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8395.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 100000121 is about 10000.0060499982. The cubic root of 100000121 is about 464.1590705720.

Adding to 100000121 its reverse (121000001), we get a palindrome (221000122).

The spelling of 100000121 in words is "one hundred million, one hundred twenty-one", and thus it is an aban number.