100421121 has 8 divisors (see below), whose sum is σ = 138214144. Its totient is φ = 64787760.

The previous prime is 100421077. The next prime is 100421143. The reversal of 100421121 is 121124001.

It is a happy number.

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

It is not a de Polignac number, because 100421121 - 2¹⁰ = 100420097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100421097 and 100421106.

It is not an unprimeable number, because it can be changed into a prime (100421021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539806 + ... + 539991.

It is an arithmetic number, because the mean of its divisors is an integer number (17276768).

Almost surely, 2^100421121 is an apocalyptic number.

It is an amenable number.

100421121 is a deficient number, since it is larger than the sum of its proper divisors (37793023).

100421121 is a wasteful number, since it uses less digits than its factorization.

100421121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079831.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 100421121 is about 10021.0339286922. The cubic root of 100421121 is about 464.8095277246.

Adding to 100421121 its reverse (121124001), we get a palindrome (221545122).

The spelling of 100421121 in words is "one hundred million, four hundred twenty-one thousand, one hundred twenty-one".